code: func (c *Configurator) IncomingHTTPSConfig() *tls.Config {
  	c.log("IncomingHTTPSConfig")
  	config := c.commonTLSConfig(c.verifyIncomingHTTPS())
  	config.NextProtos = []string{"h2", "http/1.1"}
  	config.GetConfigForClient = func(*tls.ClientHelloInfo) (*tls.Config, error) {
  		return c.IncomingHTTPSConfig(), nil
  	}
  	return config
  }
docs: // IncomingHTTPSConfig generates a *tls.Config for incoming HTTPS connections.