Service Worker

A background task to perform:

• Caching
• Background sync
• Listens to push notifications

Process

1. First visit - service worker is installed (Client → Server)
2. Online mode - service worker acting as a proxy (Client → Service Worker → Server)
3. Offline mode - service worker responding with cached responses (Client → Service Worker → Cache)

Registering A Worker

<script>
	if ('serviceWorker' in navigator){
		navigator.serviceWorker.register('/sw.js');
	}
</script>