44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
/**
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References:
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1. https://developers.google.com/web/fundamentals/primers/service-workers
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2. https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook
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3. https://googlechrome.github.io/samples/service-worker/
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4. https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers
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5. https://serviceworke.rs/
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6. https://www.youtube.com/watch?v=baSiSIyTGSk
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*/
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const RUNTIME = 'runtime';
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self.skipWaiting();
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self.addEventListener('fetch', (event) => {
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// Do nothing if not the same origin
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if (!event.request.url.startsWith(self.location.origin)) {
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return;
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}
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// Network first strategy
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event.respondWith(
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(async () => {
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const cache = await caches.open(RUNTIME);
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try {
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const networkResponse = await fetch(event.request);
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// Save/Update cache if network response is ok
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if (networkResponse && networkResponse.status === 200) {
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cache.put(event.request, networkResponse.clone());
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}
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return networkResponse;
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} catch (e) {
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const cachedResponse = await cache.match(event.request);
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return cachedResponse;
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}
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})()
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);
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});
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