Unable to connect websocket into service-workers

Question

Wants to implement background push notififications even when the application browser window is closed, to achieve this i am using service-worker and websocket,unable to use websocket in service worker file.

// in serviceworker.js file

       const webSocket = new WebSocket(`ws://local_host/socket`);
       console.log(webSocket);

//Got following error

  Uncaught DOMException: Failed to construct 'WebSocket': The 
  subprotocol '[object Object]' is invalid.

Please help regarding this issue.

Answer 1

Websockets are not supported in Service Workers.

Push notifications should be implemented using Web Push. https://developers.google.com/web/fundamentals/push-notifications/