code: func (s *Server) NodeRPC(w http.ResponseWriter, req *http.Request) {
  	node := req.Context().Value("node").(*Node)
  
  	handler := func(conn *websocket.Conn) {
  		node.ServeRPC(conn)
  	}
  
  	websocket.Server{Handler: handler}.ServeHTTP(w, req)
  }
docs: // NodeRPC forwards RPC requests to a node in the network via a WebSocket
  // connection