What response statuses does a web server return when processing requests?

Web servers return HTTP statuses, which are divided into several groups:

• 1xx (Informational): confirm receipt of the request, e.g., 100 Continue.
• 2xx (Success): the request was successfully processed, e.g., 200 OK, 201 Created.
• 3xx (Redirection): the client must take additional actions, e.g., 301 Moved Permanently, 302 Found.
• 4xx (Client errors): errors on the client side, e.g., 400 Bad Request, 401 Unauthorized, 404 Not Found.
• 5xx (Server errors): errors on the server side, e.g., 500 Internal Server Error, 503 Service Unavailable.

Each status informs the client about the result of processing the request and helps to respond correctly to the situation.