HTTP响应消息定义

    /**     * @var array HTTP response codes and messages     */    protected static $messages = array(        //Informational 1xx        100 => '100 Continue',        101 => '101 Switching Protocols',        //Successful 2xx        200 => '200 OK',        201 => '201 Created',        202 => '202 Accepted',        203 => '203 Non-Authoritative Information',        204 => '204 No Content',        205 => '205 Reset Content',        206 => '206 Partial Content',        //Redirection 3xx        300 => '300 Multiple Choices',        301 => '301 Moved Permanently',        302 => '302 Found',        303 => '303 See Other',        304 => '304 Not Modified',        305 => '305 Use Proxy',        306 => '306 (Unused)',        307 => '307 Temporary Redirect',        //Client Error 4xx        400 => '400 Bad Request',        401 => '401 Unauthorized',        402 => '402 Payment Required',        403 => '403 Forbidden',        404 => '404 Not Found',        405 => '405 Method Not Allowed',        406 => '406 Not Acceptable',        407 => '407 Proxy Authentication Required',        408 => '408 Request Timeout',        409 => '409 Conflict',        410 => '410 Gone',        411 => '411 Length Required',        412 => '412 Precondition Failed',        413 => '413 Request Entity Too Large',        414 => '414 Request-URI Too Long',        415 => '415 Unsupported Media Type',        416 => '416 Requested Range Not Satisfiable',        417 => '417 Expectation Failed',        422 => '422 Unprocessable Entity',        423 => '423 Locked',        //Server Error 5xx        500 => '500 Internal Server Error',        501 => '501 Not Implemented',        502 => '502 Bad Gateway',        503 => '503 Service Unavailable',        504 => '504 Gateway Timeout',        505 => '505 HTTP Version Not Supported'    );