code: func NewServer(conf *Config) (*Server, error) {
  	rpcsrv := rpc.NewServer()
  
  	mux := http.NewServeMux()
  	mux.HandleFunc(HTTPPath, rpcsrv.ServeHTTP)
  	mux.Handle(WSPath, rpcsrv.WebsocketHandler(conf.AllowedOrigins))
  
  	httpsrv := &http.Server{
  		Addr:    conf.Addr,
  		Handler: mux,
  	}
  
  	return &Server{
  		conf:    conf,
  		rpcsrv:  rpcsrv,
  		httpsrv: httpsrv,
  	}, nil
  }
docs: // NewServer creates a new UI server.