What can be transmitted in the body of a request?

Any data supported by the protocol and server can be transmitted in the body of an HTTP request, for example:

• JSON or XML — for transmitting structured data
• Forms (application/x-www-form-urlencoded or multipart/form-data) — for sending form data, including files
• Plain text data
• Binary data — such as images, files

The content type is specified in the Content-Type header. For example, for JSON, it is application/json.

Example of a request body with JSON:

{
  "username": "user1",
  "password": "pass123"
}