code: func HTTP2Transporter(config *tls.Config) Transporter {
  	if config == nil {
  		config = &tls.Config{InsecureSkipVerify: true}
  	}
  	return &http2Transporter{
  		clients:   make(map[string]*http.Client),
  		tlsConfig: config,
  	}
  }
docs: // HTTP2Transporter creates a Transporter that is used by HTTP2 h2 proxy client.