HTTP response status codes (rfc2616 and RFC 7231) ¶ See also https://en.wikipedia.org/wiki/List_of_HTTP_status_codes https://tools.ietf.org/html/rfc7231 https://tools.ietf.org/html/rfc2616#section-10 Mozilla HTTP status codes ¶ See also https://developer.mozilla.org/en-US/docs/Web/HTTP/Status IANA HTTP status codes ¶ See also https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml Liste ¶ 403 the server understood the request but refuses to authorize it 405 Method Not Allowed 418 I’m a teapot (RFC 2324) 500 Internal Server Error