400 Bad Request The server did not understand the request
401 Unauthorized The requested page needs a username and a password
402 Payment Required You can not use this code yet
403 Forbidden Access is forbidden to the requested page
404 Not Found The server can not find the requested page
405 Method Not Allowed The method specified in the request is not allowed
406 Not Acceptable The server can only generate a response that is not accepted by the client
407 Proxy Authentication Required You must authenticate with a proxy server before this request can be served
408 Request Timeout The request took longer than the server was prepared to wait
409 Conflict The request could not be completed because of a conflict
410 Gone The requested page is no longer available
411 Length Required The "Content-Length" is not defined. The server will not accept the request without it
412 Precondition Failed The precondition given in the request evaluated to false by the server
413 Request Entity Too Large The server will not accept the request, because the request entity is too large
414 Request-url Too Long The server will not accept the request, because the url is too long. Occurs when you convert a "post" request to a "get" request with a long query information
415 Unsupported Media Type The server will not accept the request, because the media type is not supported
