Feedback for “Subscriptions”

Authentication on the subscription topic in the documentation is unclear. I failed to authenticate using the following link over my named client.

const token = 'my_token';

const basic = setContext(() => ({
  headers: {
    Accept: 'charset=utf-8'
  }
}));

const authLink = setContext((operation, context) =>  ({
  headers: {
    Authorization: `Bearer ${token}`,
  },
}));

const splitLink = split(
  ({ query }) => {
    const definition = getMainDefinition(query);
    return (
      definition.kind === Kind.OPERATION_DEFINITION &&
      definition.operation === OperationTypeNode.SUBSCRIPTION
    );
  },
  new WebSocketLink({
    uri: `ws://localhost:5079/graphql`,
    options: {
      reconnect: true,
      connectionParams: () => ({
        authToken: `Bearer ${token}`, // also tried using Authorization:  `Bearer ${token}`,
      }),
    },
  }),
  authLink.concat(inject(HttpLink).create({
    uri: `http://localhost:5079/graphql`,
  })),
);

export const appConfig: ApplicationConfig = {
  providers: [
    provideRouter(routes),
    provideHttpClient(withFetch()),
    provideNamedApollo(() => ({
      myNamedClient: {
        link: ApolloLink.from([
          basic,
          splitLink
        ]),
        cache: new InMemoryCache(),
      }
    }))
  ]
};

The issue points to the Subscriptions authentication documentation and provides an Angular/TypeScript Apollo setup using a named client, an HTTP auth link, and WebSocket connection parameters. Locate that documentation and its subscription authentication examples first; reproduce the named-client setup and verify that the documented authentication configuration works for subscriptions.