description: Fiber represents the fiber package where you start to create an instance.

📦 Fiber

New

This method creates a new App named instance. You can pass optional settings when creating a new instance.

  1. func New(config ...Config) *App
  1. // Default config
  2. app := fiber.New()
  4. // ...

Config

You can pass an optional Config when creating a new Fiber instance.

  1. // Custom config
  2. app := fiber.New(fiber.Config{
  3.     Prefork:       true,
  4.     CaseSensitive: true,
  5.     StrictRouting: true,
  6.     ServerHeader:  "Fiber",
  7.     AppName: "Test App v1.0.1"
  8. })
  10. // ...

Config fields

Property Type Description Default
Prefork bool Enables use of theSO_REUSEPORTsocket option. This will spawn multiple Go processes listening on the same port. learn more about socket sharding. NOTE: if enabled, the application will need to be ran through a shell because prefork mode sets environment variables. If you’re using Docker, make sure the app is ran with CMD ./app or CMD ["sh", "-c", "/app"]. For more info, see this issue comment. false
ServerHeader string Enables the Server HTTP header with the given value. ""
StrictRouting bool When enabled, the router treats /foo and /foo/ as different. Otherwise, the router treats /foo and /foo/ as the same. false
CaseSensitive bool When enabled, /Foo and /foo are different routes. When disabled, /Fooand /foo are treated the same. false
Immutable bool When enabled, all values returned by context methods are immutable. By default, they are valid until you return from the handler; see issue #185. false
UnescapePath bool Converts all encoded characters in the route back before setting the path for the context, so that the routing can also work with URL encoded special characters false
ETag bool Enable or disable ETag header generation, since both weak and strong etags are generated using the same hashing method (CRC-32). Weak ETags are the default when enabled. false
BodyLimit int Sets the maximum allowed size for a request body, if the size exceeds the configured limit, it sends 413 - Request Entity Too Large response. 4 * 1024 * 1024
Concurrency int Maximum number of concurrent connections. 256 * 1024
Views Views Views is the interface that wraps the Render function. See our Template Middleware for supported engines. nil
ReadTimeout time.Duration The amount of time allowed to read the full request, including the body. The default timeout is unlimited. nil
WriteTimeout time.Duration The maximum duration before timing out writes of the response. The default timeout is unlimited. nil
IdleTimeout time.Duration The maximum amount of time to wait for the next request when keep-alive is enabled. If IdleTimeout is zero, the value of ReadTimeout is used. nil
ReadBufferSize int per-connection buffer size for requests’ reading. This also limits the maximum header size. Increase this buffer if your clients send multi-KB RequestURIs and/or multi-KB headers (for example, BIG cookies). 4096
WriteBufferSize int Per-connection buffer size for responses’ writing. 4096
CompressedFileSuffix string Adds a suffix to the original file name and tries saving the resulting compressed file under the new file name. ".fiber.gz"
ProxyHeader string This will enable c.IP() to return the value of the given header key. By default c.IP()will return the Remote IP from the TCP connection, this property can be useful if you are behind a load balancer e.g. X-Forwarded-*. ""
GETOnly bool Rejects all non-GET requests if set to true. This option is useful as anti-DoS protection for servers accepting only GET requests. The request size is limited by ReadBufferSize if GETOnly is set. false
ErrorHandler ErrorHandler ErrorHandler is executed when an error is returned from fiber.Handler. DefaultErrorHandler
DisableKeepalive bool Disable keep-alive connections, the server will close incoming connections after sending the first response to the client false
DisableDefaultDate bool When set to true causes the default date header to be excluded from the response. false
DisableDefaultContentType bool When set to true, causes the default Content-Type header to be excluded from the Response. false
DisableHeaderNormalizing bool By default all header names are normalized: conteNT-tYPE -> Content-Type false
DisableStartupMessage bool When set to true, it will not print out debug information false
AppName string This allows to setup app name for the app ""
EnableTrustedProxyCheck bool When set to true, fiber will check whether proxy is trusted, using TrustedProxies list.

By default c.Protocol() will get value from X-Forwarded-Proto, X-Forwarded-Protocol, X-Forwarded-Ssl or X-Url-Scheme header, c.IP() will get value from ProxyHeader header, c.Hostname() will get value from X-Forwarded-Host header.
If EnableTrustedProxyCheck is true, and RemoteIP is in the list of TrustedProxies c.Protocol(), c.IP(), and c.Hostname() will have the same behaviour when EnableTrustedProxyCheck disabled, if RemoteIP isn’t in the list, c.Protocol() will return https in case when tls connection is handled by the app, or http otherwise, c.IP() will return RemoteIP() from fasthttp context, c.Hostname() will return fasthttp.Request.URI().Host()		 false
TrustedProxies []string Contains the list op trusted proxy IP’s. Look at EnableTrustedProxyCheck doc. []string*__*
DisablePreParseMultipartForm bool Will not pre parse Multipart Form data if set to true. This option is useful for servers that desire to treat multipart form data as a binary blob, or choose when to parse the data. false
StreamRequestBody bool StreamRequestBody enables request body streaming, and calls the handler sooner when given body is larger then the current limit. false

NewError

NewError creates a new HTTPError instance with an optional message.

  1. func NewError(code int, message ...string) *Error
  1. app.Get("/", func(c *fiber.Ctx) error {
  2.     return fiber.NewError(782, "Custom error message")
  3. })

IsChild

IsChild determines if the current process is a result of Prefork.

  1. func IsChild() bool
  1. // Prefork will spawn child processes
  2. app := fiber.New(fiber.Config{
  3.     Prefork: true,
  4. })
  6. if !fiber.IsChild() {
  7.     fmt.Println("I'm the parent process")
  8. } else {
  9.     fmt.Println("I'm a child process")
  10. }
  12. // ...