What type of data or information is usually placed in the content of an HTTP request?

The content of an HTTP request typically includes the following information:

• Request method (GET, POST, PUT, DELETE, etc.) — defines the action.
• URL and query parameters — the resource address and parameters in the query string.
• Headers — metadata such as content type (Content-Type), authorization, cookies, language, etc.
• Request body — data sent to the server, such as JSON, XML, form-data, files, etc. Usually used in POST, PUT requests.

For example, when submitting a registration form, the request body may contain fields like username and password in JSON or form-data format.

Thus, an HTTP request contains both control information (method, headers) and user data (request body).