catarrh
450f1de68a
When a navigation fetch failed and the cache had no entry for the exact URL (e.g. '/' while only 'index.html' is precached, common while the local server restarts), the fetch handler resolved respondWith() to undefined, producing 'TypeError: Failed to convert value to Response'. The navigate fallback now chains caches.match(request) -> cached index.html -> an explicit 503 offline Response. sw.js requests are network-only with the same offline Response (previously they fell into the navigate branch), and a new unit test loads sw.js in a VM sandbox covering navigate/cache/asset/api paths. SW cache v97 -> v98.
70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
const CACHE = 'otaman-v98';
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const URLS = [
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'index.html',
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'help.html',
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'help-ru.html',
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'style.css',
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'sim.png',
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'favicon.svg',
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'icon-192.png',
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'icon-512.png',
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'manifest.json',
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'des-bundle.js',
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'aes-bundle.js',
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'sim.svg',
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'sim_anim.svg',
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'nosim.svg',
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];
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self.addEventListener('install', e => {
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e.waitUntil(
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caches.open(CACHE).then(c => c.addAll(URLS))
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);
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self.skipWaiting();
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});
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self.addEventListener('activate', e => {
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e.waitUntil(
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caches.keys().then(keys =>
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Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))
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).then(() => clients.claim())
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);
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});
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const OFFLINE_RESPONSE = new Response('Offline: page not cached', {
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status: 503,
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statusText: 'Offline',
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headers: { 'Content-Type': 'text/plain' },
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});
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self.addEventListener('fetch', e => {
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if (!e.request.url.startsWith('http')) return;
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const path = new URL(e.request.url).pathname;
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if (path.startsWith('/api/')) return; // live data, never cache
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if (e.request.method !== 'GET') return;
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const isNavigate = e.request.mode === 'navigate';
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const isSwScript = path.endsWith('/sw.js');
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if (isNavigate) {
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e.respondWith(
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fetch(e.request).then(res => {
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const clone = res.clone();
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caches.open(CACHE).then(c => c.put(e.request, clone));
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return res;
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}).catch(() =>
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caches.match(e.request)
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.then(r => r || caches.match('index.html'))
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.then(r => r || OFFLINE_RESPONSE)
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)
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);
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} else if (isSwScript) {
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e.respondWith(fetch(e.request).catch(() => OFFLINE_RESPONSE));
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} else {
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e.respondWith(
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caches.match(e.request).then(r => r || fetch(e.request).then(res => {
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const clone = res.clone();
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caches.open(CACHE).then(c => c.put(e.request, clone));
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return res;
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}))
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);
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}
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}); |