code: func ListenAndServeQUIC(addr, certFile, keyFile string, handler http.Handler) error {
  	server := &Server{
  		Server: &http.Server{
  			Addr:    addr,
  			Handler: handler,
  		},
  	}
  	return server.ListenAndServeTLS(certFile, keyFile)
  }
docs: // ListenAndServeQUIC listens on the UDP network address addr and calls the
  // handler for HTTP/3 requests on incoming connections. http.DefaultServeMux is
  // used when handler is nil.