dillonkearns/elm-pages-v3-beta
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Only serve up fallback html page if network request fails, not if it 404s.

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This commit is contained in:
Dillon Kearns 2020-02-03 17:52:10 -08:00
parent bd086bfe0e
commit 43cdad50af
1 changed files with 25 additions and 21 deletions
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46
generator/src/service-worker-template.js
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@ -8,6 +8,29 @@ workbox.precaching.precacheAndRoute(self.__precacheManifest);
const CACHE_NAME = 'shell';
const FALLBACK_HTML_URL = '/index.html';
self.addEventListener('fetch', function(event) {
event.respondWith(
// Check for cached responses first
caches.match(event.request).then(function(response) {
if (response) {
return response;
}
return fetch(event.request).then(function(response) {
// debugger
if (response.status === 404) {
// let 404 responses propogate through
return response
}
return response
});
}).catch(function() {
// If there's an exception, then the user is probably offline
return caches.match(FALLBACK_HTML_URL, {
cacheName: CACHE_NAME,
});
})
);
});
self.addEventListener('install', async (event) => {
event.waitUntil(
@ -17,26 +40,6 @@ self.addEventListener('install', async (event) => {
});
const networkOnly = new workbox.strategies.NetworkOnly();
const navigationHandler = async (params) => {
try {
// Attempt a network request.
return await networkOnly.handle(params);
} catch (error) {
// If it fails, return the cached HTML.
// workbox.precaching.getCacheKeyForURL("/index.html")
// return caches.match(workbox.precaching.getCacheKeyForURL("/index.html"));
return caches.match('/index.html', {
cacheName: CACHE_NAME,
});
}
};
// Register this strategy to handle all navigations.
workbox.routing.registerRoute(
new workbox.routing.NavigationRoute(navigationHandler)
);
workbox.routing.registerRoute(
/^https:\/\/fonts\.gstatic\.com/,
new workbox.strategies.CacheFirst({
@ -69,4 +72,5 @@ workbox.routing.registerRoute(
plugins: []
}),
"GET"
);
);