Protocols >> HTTP >> Definitions >>  Where to get more information about http status codes (200, 401 etc)

HTTP 1.0 ======== http://www.w3.org/Protocols/rfc1945/rfc1945 (look for paragraph 9. Status Code Definitions) HTTP 1.1 ======== http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html