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July 21, 2018 20:28
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Service worker with cache
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| const cacheId = 'cache-v1'; | |
| function fetchAndCache(request, cache) { | |
| return fetch(request).then(function(response) { | |
| return cache.put(request, response.clone()).then(function() { | |
| return response; | |
| }); | |
| }); | |
| } | |
| self.addEventListener('fetch', function(event) { | |
| // This prevents some weird issue with Chrome DevTools and 'only-if-cached' | |
| // Fixes issue #385, also ref to: | |
| // - https://github.com/paulirish/caltrainschedule.io/issues/49 | |
| // - https://bugs.chromium.org/p/chromium/issues/detail?id=823392 | |
| if (event.request.cache === 'only-if-cached' && event.request.mode !== 'same-origin') { | |
| return; | |
| } | |
| if (event.request.method !== 'GET') { | |
| return; | |
| } | |
| const url = new URL(event.request.url); | |
| if (url.protocol !== 'https:') { | |
| return; | |
| } | |
| if (url.origin !== location.origin) { | |
| return; | |
| } | |
| event.respondWith( | |
| caches.open(cacheId).then(function(cache) { | |
| return cache.match(event.request).then(function(response) { | |
| if (response) { | |
| event.waitUntil( | |
| fetchAndCache(event.request, cache) | |
| ); | |
| return response; | |
| } | |
| return fetchAndCache(event.request, cache); | |
| }); | |
| }) | |
| ); | |
| }); |
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