Doing this in Meteor makes the default websocket connection of meteor fail

[theodorDiaconu]

  {
    schema,
    execute,
    subscribe
  },
  {
    server: WebApp.httpServer,
    path: '/subscriptions'
  }
);

If I comment this line, Meteor is back to normal, if I enable it, Meteor falls back to XHR. Can both websockets be used in conjunction ?