glitch-service-worker.js

this.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open('v1.1').then(function(cache) {
      return cache.addAll([
        '/style.css',
        '/app.js',
        '../views/404.html',
        '../views/offline.html'
      ]);
    })
  );
});

this.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request).then(function(resp) {
      return resp || fetch(event.request).then(function(response) {
        if((event.request.url.includes('chrome-extension'))){
          //skip any caching
          return response;
        }
        if (['404','0'].includes(response.status)) {
          return caches.match('../views/404.html');
        }
        return caches.open('v1.1').then(function(cache) {
          cache.put(event.request.url, response.clone());
          return response;
        });
      });
    }).catch(error => {
      return caches.match('../views/offline.html');
    })
  );
});