Http Codes

Successful 2xx
200 OK
201 Created
202 Accepted
203 Non-Authoritative Information *
204 No Content
205 Reset Content *
206 Partial Content *

Redirection 3xx
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
303 See Other *
304 Not Modified
305 Use Proxy (proxy redirect) *

Client Error 4xx
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 *
409 Confict *
410 Gone *
411 Length Required *
412 Precondition Failed *
413 Request Entity To Large *
414 Request-URI Too Long *
415 Unsupported Media Type

Server Error 5xx
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout *
505 HTTP Version Not Supported *