What does an HTTP request consist of? Name its main parts and blocks.

An HTTP request consists of several main parts:

1. Request Line — contains the request method (GET, POST, PUT, etc.), the URL (resource path), and the HTTP protocol version.

   Example: GET /index.html HTTP/1.1

2. Headers — a set of key-value pairs that convey additional information about the request, such as content type, authorization, cookies, language, etc.

   Example:

   Host: example.com
   User-Agent: Mozilla/5.0
   Accept: text/html
   

3. Empty line — separates headers from the body of the request.

4. Body — optional part used to send data to the server, for example, in POST requests with forms or JSON.

Thus, the structure of an HTTP request looks like this:

Request Line
Headers

Body (optional)