Best way to configure Apollo client websocketLink

I’m trying for some days now to configure an apollo client link to be able to use subscription with my meteor app with no success.

import { WebSocketLink } from 'apollo-link-ws';
const wsUri =  "ws://localhost:4001/graphql";
const wsLink = () =>
  new WebSocketLink({
    uri: wsUri,
    options: {
      reconnect: true,
const apolloClient = new ApolloClient({
  connectToDevTools: true,
  link: ApolloLink.from([
  cache: new InMemoryCache(),

I get the error:
WebSocket connection to 'ws://localhost:4001/graphql' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED
Any Help?