What is contained in the server response body?

The response body is the main part of the HTTP response that contains the data sent by the server to the client. What exactly is there depends on the request type and resource:

1. HTML documents: The text of a web page displayed in the browser.
2. Images: Binary data of images (JPEG, PNG, GIF, etc.).
3. JSON/XML data: Data structured in these formats, often used for exchanging information between client and server in APIs.
4. Other file types: PDFs, audio, video files, and others.
5. Error messages: Details about an error that occurred on the server.

The format and data type in the response body are determined by the Content-Type header in the HTTP response. For example:

Content-Type: text/html; charset=utf-8

Content-Type: application/json

Content-Type: image/jpeg

The absence of a response body is possible for some statuses (e.g., 204 No Content) or HEAD requests.