private function __construct()
 {
     self::$_method = strtoupper($_SERVER['REQUEST_METHOD']);
     self::$GET = $_GET;
     self::$POST = $_POST;
     self::$SERVER = $_SERVER;
     self::$REQUEST = $_REQUEST;
     self::$FILES = $_FILES;
     self::$_args["GET"] = self::$GET;
     self::$_args["POST"] = self::$POST;
     //$headers = apache_request_headers();
     foreach ($_SERVER as $i => $val) {
         $name = str_replace(array('HTTP_', '_'), array('', '-'), $i);
         self::$_headers[strtolower($name)] = $val;
     }
 }