Success
200 OK
201 CREATED
202 Accepted
203 Partial Information
204 No Response
File Trouble
400 Bad request
401 Unauthorized
402 PaymentRequired
403 Forbidden
404 Not found
Redirection
301 Moved
302 Found
303 Method
304 Not Modified
Server Trouble
500 Internal Error
501 Not implemented
502 Service temporarily overloaded
503 Gateway timeout 503
Link
the HTTP status codes: http://www.w3.org/Protocols/HTTP/HTRESP.html