Best way to configure Apollo client websocketLink

help
1

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([
    ...
    wsLink(),
  ]),
  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?