Caching XHR get calls using Service Worker Toolbox

Question

I am trying to store the results of the XHR get call the site is making so that if there is no internet connection I want the data to be retrieved from the cache/indexedDB . I am using Sw-toolbox within my service worker. The URL i am accessing is "https://www.domain.in/field?searchparams=123" and I tried doing ,

toolbox.router.get('/field',function(request, values, options){
  console.log(request, values, options);
});

But I dont find any lead , Am I doing it wrong , ? Please help .