strategies11

sw.js

self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.open('my-app').then(function(cache) {
      return cache.match(event.request).then(function(response) {
        const fetchPromise = fetch(event.request).then(function(networkResponse) {
          cache.put(event.request, networkResponse.clone());
          return networkResponse;
        })
        return response || fetchPromise;
      })
    })
  );
});