Service Workers & Progressive Web Apps
How can you implement a fallback response in a Service Worker?
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(response => {
return response || fetch(event.request)
.catch(() => {
if (event.request.destination === 'image') {
return caches.match('/offline-image.png');
}
return caches.match('/offline.html');
});
})
);
});