public static function back($only = false, $trigger = true)
    {
        $referer = Request::header('referer');

        if ($referer === false) {
            return false;
        }

        self::$debuglvl = 3;

        if ($only) {
            static::only($referer, 302, $trigger);
        } else {
            static::to($referer, 302, $trigger);
        }
    }