Sending JSON

The previous example sends plain text, if you wish send JSON you can simply pass the object you wish to encode as JSON, whether that be a map or a POJO. As long as Jackson is able to encode it.

For example, the Message class from the previous section, you can create an instance and pass it to the POST method:

Sending a JSON body

        Flowable<HttpResponse<Message>> call = client.exchange(
                POST("/greet", new Message("Hello John")), (1)
                Message.class (2)
        );

Sending a JSON body

        Flowable<HttpResponse<Message>> call = client.exchange(
                POST("/greet", new Message("Hello John")), (1)
                Message.class (2)
        )

Sending a JSON body

            val call = client.exchange(
                    POST("/greet", Message("Hello John")), Message::class.java (2)
            )

With the above example the following JSON will be sent as the body of the request:

Resulting JSON

{"text":"Hello John"}

The JSON itself can be customized however you want using Jackson Annotations.