200 = OK
201 = Created
202 = Accepted
204 = No Content
205 = Reset Content
206 = Partial Content
301 = Moved Permanently
302 = Moved Temporarily
304 = Not Modified
400 = Bad Request
401 = Unauthorized
402 = Payment Required
403 = Forbidden
404 = Not Found
405 = Method Not Allowed
406 = Not Acceptable
407 = Proxy Authentication Required
408 = Request Timeout
500 = Internal Server Error
501 = Not Implemented
502 = Bad Gateway
503 = Service Unavailable
504 = Gateway Timeout

(agradecimentos à Gomi pela informação...)