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