  void handshakeSuc(AsyncSSLSocket* /* sock */) noexcept override {
    VLOG(7) << "client handshake success";
    if (callback_) {
      callback_->connectSuccess();
    }
    delete this;
  }
  void handshakeSuc(AsyncSSLSocket*  ) noexcept override {
    VLOG(7) << "client handshake success";
    if (callback_) {
      callback_->connectSuccess();
    }
    delete this;
  }