http status 源码

private static readonly String[][] s_HTTPStatusDescriptions = new String[][]
        {
            null,

            new String[]
            { 
                /* 100 */"Continue",
                /* 101 */ "Switching Protocols",
                /* 102 */ "Processing"
            },

            new String[]
            { 
                /* 200 */"OK",
                /* 201 */ "Created",
                /* 202 */ "Accepted",
                /* 203 */ "Non-Authoritative Information",
                /* 204 */ "No Content",
                /* 205 */ "Reset Content",
                /* 206 */ "Partial Content",
                /* 207 */ "Multi-Status"
            },

            new String[]
            { 
                /* 300 */"Multiple Choices",
                /* 301 */ "Moved Permanently",
                /* 302 */ "Found",
                /* 303 */ "See Other",
                /* 304 */ "Not Modified",
                /* 305 */ "Use Proxy",
                /* 306 */ String.Empty,
                /* 307 */ "Temporary Redirect"
            },

            new String[]
            { 
                /* 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 */ "Conflict",
                /* 410 */ "Gone",
                /* 411 */ "Length Required",
                /* 412 */ "Precondition Failed",
                /* 413 */ "Request Entity Too Large",
                /* 414 */ "Request-Uri Too Long",
                /* 415 */ "Unsupported Media Type",
                /* 416 */ "Requested Range Not Satisfiable",
                /* 417 */ "Expectation Failed",
                /* 418 */ String.Empty,
                /* 419 */ String.Empty,
                /* 420 */ String.Empty,
                /* 421 */ String.Empty,
                /* 422 */ "Unprocessable Entity",
                /* 423 */ "Locked",
                /* 424 */ "Failed Dependency"
            },

            new String[]
            { 
                /* 500 */"Internal Server Error",
                /* 501 */ "Not Implemented",
                /* 502 */ "Bad Gateway",
                /* 503 */ "Service Unavailable",
                /* 504 */ "Gateway Timeout",
                /* 505 */ "Http Version Not Supported",
                /* 506 */ String.Empty,
                /* 507 */ "Insufficient Storage"
            }
        };