APIRouter class
- fastapi.APIRouter
  - Example
- websocket
  - Example
include_router
- Example
get
- Example
put
- Example
post
- Example
delete
- Example
options
- Example
head
- Example
patch
- Example
trace
- Example
on_event

`APIRouter` class

Here’s the reference information for the APIRouter class, with all its parameters, attributes and methods.

You can import the APIRouter class directly from fastapi:

from fastapi import APIRouter

fastapi.APIRouter

APIRouter(
    *,
    prefix="",
    tags=None,
    dependencies=None,
    default_response_class=Default(JSONResponse),
    responses=None,
    callbacks=None,
    routes=None,
    redirect_slashes=True,
    default=None,
    dependency_overrides_provider=None,
    route_class=APIRoute,
    on_startup=None,
    on_shutdown=None,
    lifespan=None,
    deprecated=None,
    include_in_schema=True,
    generate_unique_id_function=Default(generate_unique_id)
)

Bases: Router

APIRouter class, used to group path operations, for example to structure an app in multiple files. It would then be included in the FastAPI app, or in another APIRouter (ultimately included in the app).

Read more about it in the FastAPI docs for Bigger Applications - Multiple Files.

Example

from fastapi import APIRouter, FastAPI
app = FastAPI()
router = APIRouter()
@router.get("/users/", tags=["users"])
async def read_users():
    return [{"username": "Rick"}, {"username": "Morty"}]
app.include_router(router)

PARAMETER	DESCRIPTION
`prefix`	An optional path prefix for the router. TYPE: `str` DEFAULT: `‘’`
`tags`	A list of tags to be applied to all the path operations in this router. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to all the path operations in this router. Read more about it in the FastAPI docs for Bigger Applications - Multiple Files. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`default_response_class`	The default response class to be used. Read more in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`responses`	Additional responses to be shown in OpenAPI. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Additional Responses in OpenAPI. And in the FastAPI docs for Bigger Applications. TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`callbacks`	OpenAPI callbacks that should apply to all path operations in this router. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`routes`	You normally wouldn’t use this parameter with FastAPI, it is inherited from Starlette and supported for compatibility. In FastAPI, you normally would use the path operation methods, like `router.get()`, `router.post()`, etc. Note: you probably shouldn’t use this parameter, it is inherited from Starlette and supported for compatibility. A list of routes to serve incoming HTTP and WebSocket requests. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`redirect_slashes`	Whether to detect and redirect slashes in URLs when the client doesn’t use the same format. TYPE: `bool` DEFAULT: `True`
`default`	Default function handler for this router. Used to handle 404 Not Found errors. TYPE: `Optional[ASGIApp]` DEFAULT: `None`
`dependency_overrides_provider`	Only used internally by FastAPI to handle dependency overrides. You shouldn’t need to use it. It normally points to the `FastAPI` app object. TYPE: `Optional[Any]` DEFAULT: `None`
`route_class`	Custom route (path operation) class to be used by this router. Read more about it in the FastAPI docs for Custom Request and APIRoute class. TYPE: `Type[APIRoute]` DEFAULT: `APIRoute`
`on_startup`	A list of startup event handler functions. You should instead use the `lifespan` handlers. Read more in the FastAPI docs for lifespan. TYPE: `Optional[Sequence[Callable[[], Any]]]` DEFAULT: `None`
`on_shutdown`	A list of shutdown event handler functions. You should instead use the `lifespan` handlers. Read more in the FastAPI docs for lifespan. TYPE: `Optional[Sequence[Callable[[], Any]]]` DEFAULT: `None`
`lifespan`	A `Lifespan` context manager handler. This replaces `startup` and `shutdown` functions with a single context manager. Read more in the FastAPI docs for lifespan. TYPE: `Optional[Lifespan[Any]]` DEFAULT: `None`
`deprecated`	Mark all path operations in this router as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[bool]` DEFAULT: `None`
`include_in_schema`	To include (or not) all the path operations in this router in the generated OpenAPI. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def init(
    self,
    ,
    prefix: Annotated[str, Doc(“An optional path prefix for the router.”)] = “”,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to all the path operations in this
            router.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to all the
            path operations in this router.
            Read more about it in the
            FastAPI docs for Bigger Applications - Multiple Files.
            “””
        ),
    ] = None,
    default_response_class: Annotated[
        Type[Response],
        Doc(
            “””
            The default response class to be used.
            Read more in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses to be shown in OpenAPI.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Additional Responses in OpenAPI.
            And in the
            FastAPI docs for Bigger Applications.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            OpenAPI callbacks that should apply to all path operations in this
            router.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    routes: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            Note: you probably shouldn’t use this parameter, it is inherited
            from Starlette and supported for compatibility.
            —-
            A list of routes to serve incoming HTTP and WebSocket requests.
            “””
        ),
        deprecated(
            “””
            You normally wouldn’t use this parameter with FastAPI, it is inherited
            from Starlette and supported for compatibility.
            In FastAPI, you normally would use the path operation methods,
            like router.get(), router.post(), etc.
            “””
        ),
    ] = None,
    redirect_slashes: Annotated[
        bool,
        Doc(
            “””
            Whether to detect and redirect slashes in URLs when the client doesn’t
            use the same format.
            “””
        ),
    ] = True,
    default: Annotated[
        Optional[ASGIApp],
        Doc(
            “””
            Default function handler for this router. Used to handle
            404 Not Found errors.
            “””
        ),
    ] = None,
    dependency_overrides_provider: Annotated[
        Optional[Any],
        Doc(
            “””
            Only used internally by FastAPI to handle dependency overrides.
            You shouldn’t need to use it. It normally points to the FastAPI app
            object.
            “””
        ),
    ] = None,
    route_class: Annotated[
        Type[APIRoute],
        Doc(
            “””
            Custom route (path operation) class to be used by this router.
            Read more about it in the
            FastAPI docs for Custom Request and APIRoute class.
            “””
        ),
    ] = APIRoute,
    on_startup: Annotated[
        Optional[Sequence[Callable[[], Any]]],
        Doc(
            “””
            A list of startup event handler functions.
            You should instead use the lifespan handlers.
            Read more in the FastAPI docs for lifespan.
            “””
        ),
    ] = None,
    on_shutdown: Annotated[
        Optional[Sequence[Callable[[], Any]]],
        Doc(
            “””
            A list of shutdown event handler functions.
            You should instead use the lifespan handlers.
            Read more in the
            FastAPI docs for lifespan.
            “””
        ),
    ] = None,
    # the generic to Lifespan[AppType] is the type of the top level application
    # which the router cannot know statically, so we use typing.Any
    lifespan: Annotated[
        Optional[Lifespan[Any]],
        Doc(
            “””
            A Lifespan context manager handler. This replaces startup and
            shutdown functions with a single context manager.
            Read more in the
            FastAPI docs for lifespan.
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark all path operations in this router as deprecated.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            To include (or not) all the path operations in this router in the
            generated OpenAPI.
            This affects the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations* shown in the generated OpenAPI.
            This is particularly useful when automatically generating clients or
            SDKs for your API.
            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generateuniqueid),
) -> None:
    super().__init(
        routes=routes,
        redirect_slashes=redirect_slashes,
        default=default,
        on_startup=on_startup,
        on_shutdown=on_shutdown,
        lifespan=lifespan,
    )
    if prefix:
        assert prefix.startswith(“/“), “A path prefix must start with ‘/‘“
        assert not prefix.endswith(
            “/“
        ), “A path prefix must not end with ‘/‘, as the routes will start with ‘/‘“
    self.prefix = prefix
    self.tags: List[Union[str, Enum]] = tags or []
    self.dependencies = list(dependencies or [])
    self.deprecated = deprecated
    self.include_in_schema = include_in_schema
    self.responses = responses or {}
    self.callbacks = callbacks or []
    self.dependency_overrides_provider = dependency_overrides_provider
    self.route_class = route_class
    self.default_response_class = default_response_class
    self.generate_unique_id_function = generate_unique_id_function

websocket

websocket(path, name=None, *, dependencies=None)

Decorate a WebSocket function.

Read more about it in the FastAPI docs for WebSockets.

Example

Example

from fastapi import APIRouter, FastAPI, WebSocket
app = FastAPI()
router = APIRouter()
@router.websocket("/ws")
async def websocket_endpoint(websocket: WebSocket):
    await websocket.accept()
    while True:
        data = await websocket.receive_text()
        await websocket.send_text(f"Message text was: {data}")
app.include_router(router)

PARAMETER	DESCRIPTION
`path`	WebSocket path. TYPE: `str`
`name`	A name for the WebSocket. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be used for this WebSocket. Read more about it in the FastAPI docs for WebSockets. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`

Source code in fastapi/routing.py

def websocket(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            WebSocket path.
            “””
        ),
    ],
    name: Annotated[
        Optional[str],
        Doc(
            “””
            A name for the WebSocket. Only used internally.
            “””
        ),
    ] = None,
    ,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be used for this
            WebSocket.
            Read more about it in the
            FastAPI docs for WebSockets.
            “””
        ),
    ] = None,
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Decorate a WebSocket function.
    Read more about it in the
    FastAPI docs for WebSockets.
    *Example
    ## Example
    python</span>
<span>    from fastapi import APIRouter, FastAPI, WebSocket</span>
<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>
<span>    @router.websocket("/ws")</span>
<span>    async def websocket_endpoint(websocket: WebSocket):</span>
<span>        await websocket.accept()</span>
<span>        while True:</span>
<span>            data = await websocket.receive_text()</span>
<span>            await websocket.send_text(f"Message text was: {data}")</span>
<span>    app.include_router(router)</span>
<span>
    “””
    def decorator(func: DecoratedCallable) -> DecoratedCallable:
        self.add_api_websocket_route(
            path, func, name=name, dependencies=dependencies
        )
        return func
    return decorator

include_router

include_router(
    router,
    *,
    prefix="",
    tags=None,
    dependencies=None,
    default_response_class=Default(JSONResponse),
    responses=None,
    callbacks=None,
    deprecated=None,
    include_in_schema=True,
    generate_unique_id_function=Default(generate_unique_id)
)

Include another APIRouter in the same current APIRouter.

Read more about it in the FastAPI docs for Bigger Applications.

Example

from fastapi import APIRouter, FastAPI
app = FastAPI()
internal_router = APIRouter()
users_router = APIRouter()
@users_router.get("/users/")
def read_users():
    return [{"name": "Rick"}, {"name": "Morty"}]
internal_router.include_router(users_router)
app.include_router(internal_router)

PARAMETER	DESCRIPTION
`router`	The `APIRouter` to include. TYPE: `APIRouter`
`prefix`	An optional path prefix for the router. TYPE: `str` DEFAULT: `‘’`
`tags`	A list of tags to be applied to all the path operations in this router. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to all the path operations in this router. Read more about it in the FastAPI docs for Bigger Applications - Multiple Files. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`default_response_class`	The default response class to be used. Read more in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`responses`	Additional responses to be shown in OpenAPI. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Additional Responses in OpenAPI. And in the FastAPI docs for Bigger Applications. TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`callbacks`	OpenAPI callbacks that should apply to all path operations in this router. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`deprecated`	Mark all path operations in this router as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[bool]` DEFAULT: `None`
`include_in_schema`	Include (or not) all the path operations in this router in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). TYPE: `bool` DEFAULT: `True`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def include_router(
    self,
    router: Annotated[“APIRouter”, Doc(“The APIRouter to include.”)],
    ,
    prefix: Annotated[str, Doc(“An optional path prefix for the router.”)] = “”,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to all the path operations in this
            router.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to all the
            path operations in this router.
            Read more about it in the
            FastAPI docs for Bigger Applications - Multiple Files.
            “””
        ),
    ] = None,
    default_response_class: Annotated[
        Type[Response],
        Doc(
            “””
            The default response class to be used.
            Read more in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses to be shown in OpenAPI.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Additional Responses in OpenAPI.
            And in the
            FastAPI docs for Bigger Applications.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            OpenAPI callbacks that should apply to all path operations in this
            router.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark all path operations in this router as deprecated.
            It will be added to the generated OpenAPI (e.g. visible at /docs).
            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include (or not) all the path operations in this router in the
            generated OpenAPI schema.
            This affects the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = True,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.
            This is particularly useful when automatically generating clients or
            SDKs for your API.
            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> None:
    “””
    Include another APIRouter in the same current APIRouter.
    Read more about it in the
    FastAPI docs for Bigger Applications.
    ## Example
    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    app = FastAPI()</span>
<span>    internal_router = APIRouter()</span>
<span>    users_router = APIRouter()</span>
<span>    @users_router.get("/users/")</span>
<span>    def read_users():</span>
<span>        return [{"name": "Rick"}, {"name": "Morty"}]</span>
<span>    internal_router.include_router(users_router)</span>
<span>    app.include_router(internal_router)</span>
<span>
    “””
    if prefix:
        assert prefix.startswith(“/“), “A path prefix must start with ‘/‘“
        assert not prefix.endswith(
            “/“
        ), “A path prefix must not end with ‘/‘, as the routes will start with ‘/‘“
    else:
        for r in router.routes:
            path = getattr(r, “path”)  # noqa: B009
            name = getattr(r, “name”, “unknown”)
            if path is not None and not path:
                raise FastAPIError(
                    f“Prefix and path cannot be both empty (path operation: {name})”
                )
    if responses is None:
        responses = {}
    for route in router.routes:
        if isinstance(route, APIRoute):
            combined_responses = {*responses, route.responses}
            use_response_class = get_value_or_default(
                route.response_class,
                router.default_response_class,
                default_response_class,
                self.default_response_class,
            )
            current_tags = []
            if tags:
                current_tags.extend(tags)
            if route.tags:
                current_tags.extend(route.tags)
            current_dependencies: List[params.Depends] = []
            if dependencies:
                current_dependencies.extend(dependencies)
            if route.dependencies:
                current_dependencies.extend(route.dependencies)
            current_callbacks = []
            if callbacks:
                current_callbacks.extend(callbacks)
            if route.callbacks:
                current_callbacks.extend(route.callbacks)
            current_generate_unique_id = get_value_or_default(
                route.generate_unique_id_function,
                router.generate_unique_id_function,
                generate_unique_id_function,
                self.generate_unique_id_function,
            )
            self.add_api_route(
                prefix + route.path,
                route.endpoint,
                response_model=route.response_model,
                status_code=route.status_code,
                tags=current_tags,
                dependencies=current_dependencies,
                summary=route.summary,
                description=route.description,
                response_description=route.response_description,
                responses=combined_responses,
                deprecated=route.deprecated or deprecated or self.deprecated,
                methods=route.methods,
                operation_id=route.operation_id,
                response_model_include=route.response_model_include,
                response_model_exclude=route.response_model_exclude,
                response_model_by_alias=route.response_model_by_alias,
                response_model_exclude_unset=route.response_model_exclude_unset,
                response_model_exclude_defaults=route.response_model_exclude_defaults,
                response_model_exclude_none=route.response_model_exclude_none,
                include_in_schema=route.include_in_schema
                and self.include_in_schema
                and include_in_schema,
                response_class=use_response_class,
                name=route.name,
                route_class_override=type(route),
                callbacks=current_callbacks,
                openapi_extra=route.openapi_extra,
                generate_unique_id_function=current_generate_unique_id,
            )
        elif isinstance(route, routing.Route):
            methods = list(route.methods or [])
            self.add_route(
                prefix + route.path,
                route.endpoint,
                methods=methods,
                include_in_schema=route.include_in_schema,
                name=route.name,
            )
        elif isinstance(route, APIWebSocketRoute):
            current_dependencies = []
            if dependencies:
                current_dependencies.extend(dependencies)
            if route.dependencies:
                current_dependencies.extend(route.dependencies)
            self.add_api_websocket_route(
                prefix + route.path,
                route.endpoint,
                dependencies=current_dependencies,
                name=route.name,
            )
        elif isinstance(route, routing.WebSocketRoute):
            self.add_websocket_route(
                prefix + route.path, route.endpoint, name=route.name
            )
    for handler in router.on_startup:
        self.add_event_handler(“startup”, handler)
    for handler in router.on_shutdown:
        self.add_event_handler(“shutdown”, handler)

get

get(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP GET operation.

Example

from fastapi import APIRouter, FastAPI

app = FastAPI()
router = APIRouter()

@router.get("/items/")
def read_items():
    return [{"name": "Empanada"}, {"name": "Arepa"}]

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def get(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP GET operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.get("/items/")</span>
<span>    def read_items():</span>
<span>        return [{"name": "Empanada"}, {"name": "Arepa"}]</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“GET”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

put

put(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP PUT operation.

Example

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None

app = FastAPI()
router = APIRouter()

@router.put("/items/{item_id}")
def replace_item(item_id: str, item: Item):
    return {"message": "Item replaced", "id": item_id}

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def put(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP PUT operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    from pydantic import BaseModel</span>

<span>    class Item(BaseModel):</span>
<span>        name: str</span>
<span>        description: str | None = None</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.put("/items/{item_id}")</span>
<span>    def replace_item(item_id: str, item: Item):</span>
<span>        return {"message": "Item replaced", "id": item_id}</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“PUT”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

post

post(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP POST operation.

Example

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None

app = FastAPI()
router = APIRouter()

@router.post("/items/")
def create_item(item: Item):
    return {"message": "Item created"}

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def post(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP POST operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    from pydantic import BaseModel</span>

<span>    class Item(BaseModel):</span>
<span>        name: str</span>
<span>        description: str | None = None</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.post("/items/")</span>
<span>    def create_item(item: Item):</span>
<span>        return {"message": "Item created"}</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“POST”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

delete

delete(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP DELETE operation.

Example

from fastapi import APIRouter, FastAPI

app = FastAPI()
router = APIRouter()

@router.delete("/items/{item_id}")
def delete_item(item_id: str):
    return {"message": "Item deleted"}

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def delete(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP DELETE operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.delete("/items/{item_id}")</span>
<span>    def delete_item(item_id: str):</span>
<span>        return {"message": "Item deleted"}</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“DELETE”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

options

options(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP OPTIONS operation.

Example

from fastapi import APIRouter, FastAPI

app = FastAPI()
router = APIRouter()

@router.options("/items/")
def get_item_options():
    return {"additions": ["Aji", "Guacamole"]}

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def options(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP OPTIONS operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.options("/items/")</span>
<span>    def get_item_options():</span>
<span>        return {"additions": ["Aji", "Guacamole"]}</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“OPTIONS”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

head

head(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP HEAD operation.

Example

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None

app = FastAPI()
router = APIRouter()

@router.head("/items/", status_code=204)
def get_items_headers(response: Response):
    response.headers["X-Cat-Dog"] = "Alone in the world"

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def head(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP HEAD operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    from pydantic import BaseModel</span>

<span>    class Item(BaseModel):</span>
<span>        name: str</span>
<span>        description: str | None = None</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.head("/items/", status_code=204)</span>
<span>    def get_items_headers(response: Response):</span>
<span>        response.headers["X-Cat-Dog"] = "Alone in the world"</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“HEAD”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

patch

patch(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP PATCH operation.

Example

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None

app = FastAPI()
router = APIRouter()

@router.patch("/items/")
def update_item(item: Item):
    return {"message": "Item updated in place"}

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def patch(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP PATCH operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    from pydantic import BaseModel</span>

<span>    class Item(BaseModel):</span>
<span>        name: str</span>
<span>        description: str | None = None</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.patch("/items/")</span>
<span>    def update_item(item: Item):</span>
<span>        return {"message": "Item updated in place"}</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“PATCH”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

trace

trace(
    path,
    *,
    response_model=Default(None),
    status_code=None,
    tags=None,
    dependencies=None,
    summary=None,
    description=None,
    response_description="Successful Response",
    responses=None,
    deprecated=None,
    operation_id=None,
    response_model_include=None,
    response_model_exclude=None,
    response_model_by_alias=True,
    response_model_exclude_unset=False,
    response_model_exclude_defaults=False,
    response_model_exclude_none=False,
    include_in_schema=True,
    response_class=Default(JSONResponse),
    name=None,
    callbacks=None,
    openapi_extra=None,
    generate_unique_id_function=Default(generate_unique_id)
)

Add a path operation using an HTTP TRACE operation.

Example

from fastapi import APIRouter, FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    description: str | None = None

app = FastAPI()
router = APIRouter()

@router.put("/items/{item_id}")
def trace_item(item_id: str):
    return None

app.include_router(router)

PARAMETER	DESCRIPTION
`path`	The URL path to be used for this path operation. For example, in `http://example.com/items`, the path is `/items`. TYPE: `str`
`response_model`	The type to use for the response. It could be any valid Pydantic field type. So, it doesn’t have to be a Pydantic model, it could be other things, like a `list`, `dict`, etc. It will be used for: Documentation: the generated OpenAPI (and the UI at `/docs`) will show it as the response (JSON Schema). Serialization: you could return an arbitrary object and the `response_model` would be used to serialize that object into the corresponding JSON. Filtering: the JSON sent to the client will only contain the data (fields) defined in the `response_model`. If you returned an object that contains an attribute `password` but the `response_model` does not include that field, the JSON sent to the client would not have that `password`. Validation: whatever you return will be serialized with the `response_model`, converting any data as necessary to generate the corresponding JSON. But if the data in the object returned is not valid, that would mean a violation of the contract with the client, so it’s an error from the API developer. So, FastAPI will raise an error and return a 500 error code (Internal Server Error). Read more about it in the FastAPI docs for Response Model. TYPE: `Any` DEFAULT: `Default(None)`
`status_code`	The default status code to be used for the response. You could override the status code by returning a response directly. Read more about it in the FastAPI docs for Response Status Code. TYPE: `Optional[int]` DEFAULT: `None`
`tags`	A list of tags to be applied to the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[List[Union[str, Enum]]]` DEFAULT: `None`
`dependencies`	A list of dependencies (using `Depends()`) to be applied to the path operation. Read more about it in the FastAPI docs for Dependencies in path operation decorators. TYPE: `Optional[Sequence[Depends]]` DEFAULT: `None`
`summary`	A summary for the path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`description`	A description for the path operation. If not provided, it will be extracted automatically from the docstring of the path operation function. It can contain Markdown. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Path Operation Configuration. TYPE: `Optional[str]` DEFAULT: `None`
`response_description`	The description for the default response. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `str` DEFAULT: `‘Successful Response’`
`responses`	Additional responses that could be returned by this path operation. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[Dict[Union[int, str], Dict[str, Any]]]` DEFAULT: `None`
`deprecated`	Mark this path operation as deprecated. It will be added to the generated OpenAPI (e.g. visible at `/docs`). TYPE: `Optional[bool]` DEFAULT: `None`
`operation_id`	Custom operation ID to be used by this path operation. By default, it is generated automatically. If you provide a custom operation ID, you need to make sure it is unique for the whole API. You can customize the operation ID generation with the parameter `generate_unique_id_function` in the `FastAPI` class. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Optional[str]` DEFAULT: `None`
`response_model_include`	Configuration passed to Pydantic to include only certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_exclude`	Configuration passed to Pydantic to exclude certain fields in the response data. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `Optional[IncEx]` DEFAULT: `None`
`response_model_by_alias`	Configuration passed to Pydantic to define if the response model should be serialized by alias when an alias is used. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `True`
`response_model_exclude_unset`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that were not set and have their default values. This is different from `response_model_exclude_defaults` in that if the fields are set, they will be included in the response, even if the value is the same as the default. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_defaults`	Configuration passed to Pydantic to define if the response data should have all the fields, including the ones that have the same value as the default. This is different from `response_model_exclude_unset` in that if the fields are set but contain the same default values, they will be excluded from the response. When `True`, default values are omitted from the response. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`response_model_exclude_none`	Configuration passed to Pydantic to define if the response data should exclude fields set to `None`. This is much simpler (less smart) than `response_model_exclude_unset` and `response_model_exclude_defaults`. You probably want to use one of those two instead of this one, as those allow returning `None` values when it makes sense. Read more about it in the FastAPI docs for Response Model - Return Type. TYPE: `bool` DEFAULT: `False`
`include_in_schema`	Include this path operation in the generated OpenAPI schema. This affects the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for Query Parameters and String Validations. TYPE: `bool` DEFAULT: `True`
`response_class`	Response class to be used for this path operation. This will not be used if you return a response directly. Read more about it in the FastAPI docs for Custom Response - HTML, Stream, File, others. TYPE: `Type[Response]` DEFAULT: `Default(JSONResponse)`
`name`	Name for this path operation. Only used internally. TYPE: `Optional[str]` DEFAULT: `None`
`callbacks`	List of path operations that will be used as OpenAPI callbacks. This is only for OpenAPI documentation, the callbacks won’t be used directly. It will be added to the generated OpenAPI (e.g. visible at `/docs`). Read more about it in the FastAPI docs for OpenAPI Callbacks. TYPE: `Optional[List[BaseRoute]]` DEFAULT: `None`
`openapi_extra`	Extra metadata to be included in the OpenAPI schema for this path operation. Read more about it in the FastAPI docs for Path Operation Advanced Configuration. TYPE: `Optional[Dict[str, Any]]` DEFAULT: `None`
`generate_unique_id_function`	Customize the function used to generate unique IDs for the path operations shown in the generated OpenAPI. This is particularly useful when automatically generating clients or SDKs for your API. Read more about it in the FastAPI docs about how to Generate Clients. TYPE: `Callable[[APIRoute], str]` DEFAULT: `Default(generate_unique_id)`

Source code in fastapi/routing.py

def trace(
    self,
    path: Annotated[
        str,
        Doc(
            “””
            The URL path to be used for this path operation.

            For example, in http://example.com/items, the path is /items.
            “””
        ),
    ],
    ,
    response_model: Annotated[
        Any,
        Doc(
            “””
            The type to use for the response.

            It could be any valid Pydantic field type. So, it doesn’t have to
            be a Pydantic model, it could be other things, like a list, dict,
            etc.

            It will be used for:

             Documentation: the generated OpenAPI (and the UI at /docs) will
                show it as the response (JSON Schema).
             Serialization: you could return an arbitrary object and the
                response_model would be used to serialize that object into the
                corresponding JSON.
             Filtering: the JSON sent to the client will only contain the data
                (fields) defined in the response_model. If you returned an object
                that contains an attribute password but the response_model does
                not include that field, the JSON sent to the client would not have
                that password.
             Validation: whatever you return will be serialized with the
                response_model, converting any data as necessary to generate the
                corresponding JSON. But if the data in the object returned is not
                valid, that would mean a violation of the contract with the client,
                so it’s an error from the API developer. So, FastAPI will raise an
                error and return a 500 error code (Internal Server Error).

            Read more about it in the
            FastAPI docs for Response Model.
            “””
        ),
    ] = Default(None),
    status_code: Annotated[
        Optional[int],
        Doc(
            “””
            The default status code to be used for the response.

            You could override the status code by returning a response directly.

            Read more about it in the
            FastAPI docs for Response Status Code.
            “””
        ),
    ] = None,
    tags: Annotated[
        Optional[List[Union[str, Enum]]],
        Doc(
            “””
            A list of tags to be applied to the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    dependencies: Annotated[
        Optional[Sequence[params.Depends]],
        Doc(
            “””
            A list of dependencies (using Depends()) to be applied to the
            path operation.

            Read more about it in the
            FastAPI docs for Dependencies in path operation decorators.
            “””
        ),
    ] = None,
    summary: Annotated[
        Optional[str],
        Doc(
            “””
            A summary for the path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    description: Annotated[
        Optional[str],
        Doc(
            “””
            A description for the path operation.

            If not provided, it will be extracted automatically from the docstring
            of the path operation function.

            It can contain Markdown.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Path Operation Configuration.
            “””
        ),
    ] = None,
    response_description: Annotated[
        str,
        Doc(
            “””
            The description for the default response.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = “Successful Response”,
    responses: Annotated[
        Optional[Dict[Union[int, str], Dict[str, Any]]],
        Doc(
            “””
            Additional responses that could be returned by this path operation.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    deprecated: Annotated[
        Optional[bool],
        Doc(
            “””
            Mark this path operation as deprecated.

            It will be added to the generated OpenAPI (e.g. visible at /docs).
            “””
        ),
    ] = None,
    operation_id: Annotated[
        Optional[str],
        Doc(
            “””
            Custom operation ID to be used by this path operation.

            By default, it is generated automatically.

            If you provide a custom operation ID, you need to make sure it is
            unique for the whole API.

            You can customize the
            operation ID generation with the parameter
            generate_unique_id_function in the FastAPI class.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = None,
    response_model_include: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to include only certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_exclude: Annotated[
        Optional[IncEx],
        Doc(
            “””
            Configuration passed to Pydantic to exclude certain fields in the
            response data.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = None,
    response_model_by_alias: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response model
            should be serialized by alias when an alias is used.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = True,
    response_model_exclude_unset: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that were not set and
            have their default values. This is different from
            response_model_exclude_defaults in that if the fields are set,
            they will be included in the response, even if the value is the same
            as the default.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_defaults: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data
            should have all the fields, including the ones that have the same value
            as the default. This is different from response_model_exclude_unset
            in that if the fields are set but contain the same default values,
            they will be excluded from the response.

            When True, default values are omitted from the response.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    response_model_exclude_none: Annotated[
        bool,
        Doc(
            “””
            Configuration passed to Pydantic to define if the response data should
            exclude fields set to None.

            This is much simpler (less smart) than response_model_exclude_unset
            and response_model_exclude_defaults. You probably want to use one of
            those two instead of this one, as those allow returning None values
            when it makes sense.

            Read more about it in the
            FastAPI docs for Response Model - Return Type.
            “””
        ),
    ] = False,
    include_in_schema: Annotated[
        bool,
        Doc(
            “””
            Include this path operation in the generated OpenAPI schema.

            This affects the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for Query Parameters and String Validations.
            “””
        ),
    ] = True,
    response_class: Annotated[
        Type[Response],
        Doc(
            “””
            Response class to be used for this path operation.

            This will not be used if you return a response directly.

            Read more about it in the
            FastAPI docs for Custom Response - HTML, Stream, File, others.
            “””
        ),
    ] = Default(JSONResponse),
    name: Annotated[
        Optional[str],
        Doc(
            “””
            Name for this path operation. Only used internally.
            “””
        ),
    ] = None,
    callbacks: Annotated[
        Optional[List[BaseRoute]],
        Doc(
            “””
            List of path operations that will be used as OpenAPI callbacks.

            This is only for OpenAPI documentation, the callbacks won’t be used
            directly.

            It will be added to the generated OpenAPI (e.g. visible at /docs).

            Read more about it in the
            FastAPI docs for OpenAPI Callbacks.
            “””
        ),
    ] = None,
    openapi_extra: Annotated[
        Optional[Dict[str, Any]],
        Doc(
            “””
            Extra metadata to be included in the OpenAPI schema for this path
            operation.

            Read more about it in the
            FastAPI docs for Path Operation Advanced Configuration.
            “””
        ),
    ] = None,
    generate_unique_id_function: Annotated[
        Callable[[APIRoute], str],
        Doc(
            “””
            Customize the function used to generate unique IDs for the path
            operations shown in the generated OpenAPI.

            This is particularly useful when automatically generating clients or
            SDKs for your API.

            Read more about it in the
            FastAPI docs about how to Generate Clients.
            “””
        ),
    ] = Default(generate_unique_id),
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add a path operation* using an HTTP TRACE operation.

    ## Example

    python</span>
<span>    from fastapi import APIRouter, FastAPI</span>
<span>    from pydantic import BaseModel</span>

<span>    class Item(BaseModel):</span>
<span>        name: str</span>
<span>        description: str | None = None</span>

<span>    app = FastAPI()</span>
<span>    router = APIRouter()</span>

<span>    @router.put("/items/{item_id}")</span>
<span>    def trace_item(item_id: str):</span>
<span>        return None</span>

<span>    app.include_router(router)</span>
<span>
    “””
    return self.api_route(
        path=path,
        response_model=response_model,
        status_code=status_code,
        tags=tags,
        dependencies=dependencies,
        summary=summary,
        description=description,
        response_description=response_description,
        responses=responses,
        deprecated=deprecated,
        methods=[“TRACE”],
        operation_id=operation_id,
        response_model_include=response_model_include,
        response_model_exclude=response_model_exclude,
        response_model_by_alias=response_model_by_alias,
        response_model_exclude_unset=response_model_exclude_unset,
        response_model_exclude_defaults=response_model_exclude_defaults,
        response_model_exclude_none=response_model_exclude_none,
        include_in_schema=include_in_schema,
        response_class=response_class,
        name=name,
        callbacks=callbacks,
        openapi_extra=openapi_extra,
        generate_unique_id_function=generate_unique_id_function,
    )

on_event

on_event(event_type)

Add an event handler for the router.

on_event is deprecated, use lifespan event handlers instead.

Read more about it in the FastAPI docs for Lifespan Events.

PARAMETER	DESCRIPTION
`event_type`	The type of event. `startup` or `shutdown`. TYPE: `str`

Source code in fastapi/routing.py

@deprecated(
    “””
    on_event is deprecated, use lifespan event handlers instead.

    Read more about it in the
    FastAPI docs for Lifespan Events.
    “””
)
def on_event(
    self,
    event_type: Annotated[
        str,
        Doc(
            “””
            The type of event. startup or shutdown.
            “””
        ),
    ],
) -> Callable[[DecoratedCallable], DecoratedCallable]:
    “””
    Add an event handler for the router.

    on_event is deprecated, use lifespan event handlers instead.

    Read more about it in the
    FastAPI docs for Lifespan Events.
    “””

    def decorator(func: DecoratedCallable) -> DecoratedCallable:
        self.add_event_handler(event_type, func)
        return func

    return decorator

APIRouter class

APIRouter class

fastapi.APIRouter

Example

websocket

Example

include_router

Example

get

Example

put

Example

post

Example

delete

Example

options

Example

head

Example

patch

Example

trace

Example

on_event

`APIRouter` class