HTTP - Cont.

The server processes the request and responds with one of several response types:

20X - document found, here it is, or otherwise operation confirmed.

30X - redirection - document exists, but in a different URL.

40X - access denied - invalid authentication data, permission denied, document not found, etc.

50X - internal server error - bad configuration data, invalid output generated by a server-side program, etc.
server.