Can you name the main HTTP status codes and explain their meanings?

Main HTTP status codes and their meanings:

• 1xx (Informational): Request received, processing continues.

  • 100 Continue — The client can continue sending the request.

• 2xx (Success): The request was successfully processed.

  • 200 OK — The request was successful.
  • 201 Created — The resource was successfully created.
  • 204 No Content — The request was successful, but no response body.

• 3xx (Redirection): Additional action by the client is required.

  • 301 Moved Permanently — The resource has been permanently moved.
  • 302 Found — Temporary redirect.
  • 304 Not Modified — The resource has not changed, use cache.

• 4xx (Client errors): Error in the request.

  • 400 Bad Request — Invalid request.
  • 401 Unauthorized — Authentication required.
  • 403 Forbidden — Access is denied.
  • 404 Not Found — Resource not found.

• 5xx (Server errors): Error on the server side.

  • 500 Internal Server Error — Internal server error.
  • 502 Bad Gateway — Bad response from another server.
  • 503 Service Unavailable — Service is unavailable.

These codes help the client understand the result of the request and take appropriate actions.