Initial commit

sw.js

@@ -70,6 +70,15 @@ self.addEventListener('activate', event => {
   );
 });
 
+self.addEventListener('fetch', (event) => {
+  console.log('[ServiceWorker] Fetch');
+  event.respondWith(
+      caches.match(event.request).then((cachedResponse) => {
+          return cachedResponse || fetch(event.request);
+      })
+  );
+});
+
 // Helper function to determine if a response should be cached
 function shouldCacheResponse(request, response) {
   // Only cache GET requests