Gpf_Http::isSSL PHP Method

        public static function isSSL()
        {
            if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == "https") {
                return true;
            }
            if (isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) != "off") {
                return true;
            }
            return false;
        }