Can you list the main HTTP status codes and their purposes?

Main HTTP status codes and their purposes:

• 1xx (Informational): Indicate that the request has been received and is being processed.
• 2xx (Success): The request was successfully processed.
  • 200 OK — The request was successful.
  • 201 Created — The resource was successfully created.
• 3xx (Redirection): The client must take additional actions to complete the request.
  • 301 Moved Permanently — The resource has been permanently moved.
  • 302 Found — Temporary redirect.
• 4xx (Client errors): Errors on the client side.
  • 400 Bad Request — Invalid request.
  • 401 Unauthorized — Authentication is required.
  • 403 Forbidden — Access is denied.
  • 404 Not Found — The resource was not found.
• 5xx (Server errors): Errors on the server side.
  • 500 Internal Server Error — Internal server error.
  • 503 Service Unavailable — Service is unavailable.

Knowing these codes helps to correctly handle server responses in applications.