Caching Code Successful 2xx c 200 OK 201 Created 202 Accepted c 203 Non-Authoriative Information * E 204 No Content 205 Reset Content * 206 Partial Content * Redirection 3xx C 300 Multiple Choices C 301 Moved Permanently t 302 Moved Temporarily - 303 See Other * - 304 Not Modified E 305 Use Proxy (proxy redirect) * Client Error 4xx E 400 Bad Request - 401 Unauthorized 402 Payment Required * E 403 Forbidden E 404 Not Found E 405 Method Not Allowed * 406 Not Acceptable * - 407 Proxy Authentication Required * 408 Request Timeout * 409 Confict * C 410 Gone * 411 Length Required * 412 Precondition Failed * 413 Request Entity To Large * E 414 Request-URI Too Long * 415 Unsupported Media Type Server Error 5xx E 500 Internal Server Error E 501 Not Implemented E 502 Bad Gateway E 503 Service Unavailable E 504 Gateway Timeout * 505 HTTP Version Not Supported * Notes: * HTTP 1.1 c Cached unless a query response without expiry information C Cached E Negatively cached if no expiry headers t Cached only if expiry information - Not cached Unless other said, the response code is not cached.