code: static function create(string $app, ?string $listen = null, ?array $ssl = null) {
          parent::create($app);
          self::$_apps[$app] = new self($app, $listen ? 'http://'.$listen : null, $ssl);
      }
docs: 注册服务
  
  @param string $app
  @param string $listen
  @param array $ssl