public static function getAuth()
    {
        $result = null;
        if ($user = Arr::key('PHP_AUTH_USER', $_SERVER, true)) {
            $result .= $user;

            if ($password = Arr::key('PHP_AUTH_PW', $_SERVER, true)) {
                $result .= ':' . $password;
            }

            $result .= '@';
        }

        return $result;
    }