title: Checking for service worker updates in a single page app
body: <p>We have a signal page application that has Service worker installed and active. </p>
  
  <p>Now our server rebuilds the app, Service worker file is being updated on the server side.</p>
  
  <p>Our client has no idea about this new Service worker file and it is still using old Service worker file. </p>
  
  <p><strong>When It works?</strong>
     if I refresh/reload the app, new service worker is being installed .</p>
  
  <p><strong>How can we refresh the client if service worker file is being updated on the server and client is not being reloaded?</strong></p>
  
  <p><strong>Possible solution</strong>:
     I think,I need to do the polling after 1 hour or something.</p>