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// https://gist.github.com/adactio/3717b7da007a9363ddf21f584aae34af
// HTML files: try the network first, then the cache.
// Other files: try the cache first, then the network.
// Both: cache a fresh version if possible.
// (beware: the cache will grow and grow; there's no cleanup)
const cacheName = "notes-cache-v1";
addEventListener("fetch", fetchEvent => {
const request = fetchEvent.request;
if (request.method !== "GET") return;
fetchEvent.respondWith(async () => {
const fetchPromise = fetch(request);
fetchEvent.waitUntil(async () => {
const responseFromFetch = await fetchPromise;
const responseCopy = responseFromFetch.clone();
const myCache = await caches.open(cacheName);
return myCache.put(request, responseCopy);
}());
if (request.headers.get("Accept").includes("text/html")) {
try { return await fetchPromise; }
catch(error) { return caches.match(request); }
} else {
const responseFromCache = await caches.match(request);
return responseFromCache || fetchPromise;
}
}());
});
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