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/ 5 Years ago, wed, april 17, 2019, 12:00:00
I'm running a one page landing in HTML5 and i've used bitsofcode's tutorial (https://bitsofco.de/setting-up-a-basic-service-worker/) to implement my first service worker.
Page is set up on one.com and run through cloudflare.
I've added some caching files, but other that that it's intact from source.
Chrome console gives me this error:
Uncaught (in promise) DOMException service-worker.js:1
I know it fires up because before the error I get:
[ServiceWorker] Installed
[ServiceWorker] Caching cacheFiles
Looking into the logs i see these messages:
Console: {
lineNumber:24,
message:[ServiceWorker] Installed,
message_level:1,
sourceIdentifier:3,
sourceURL:https://WWW.MYURL.COM/service-worker.js
}
Console: {
lineNumber:33,
message:[ServiceWorker] Caching cacheFiles,
message_level:1,
sourceIdentifier:3,
sourceURL:https://WWW.MYURL.COM/service-worker.js
}
Error: {
columnNumber:-1,
lineNumber:-1,
message:ServiceWorker failed to install: ServiceWorker failed to handle event (event.waitUntil Promise rejected),
sourceURL:
}
Console: {
lineNumber:0,
message:Uncaught (in promise) InvalidStateError: Cache.addAll(): duplicate requests (https://WWW.MYURL.COM/favicon-32x32.png),
message_level:3,
sourceIdentifier:1,
sourceURL:https://WWW.MYURL.COM/service-worker.js
}
Service-worker.js
var cacheName = 'v7';
// Default files to always cache
var cacheFiles = [
'./',
'./index.html',
'./favicon-96x96.png',
'./favicon-196x196.png',
'./favicon-128.png',
'./favicon-16x16.png',
'./favicon-32x32.png',
'./favicon-32x32.png',
'./manifest.json',
'./assets/css/images/bg2.jpg',
'./assets/css/images/bg2.webp',
'./assets/css/font-awesome.min.css',
'./assets/fonts/fontawesome-webfont.woff2?v=4.7.0',
'./assets/css/main.css',
'https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,900'
]
self.addEventListener('install', function(e) {
console.log('[ServiceWorker] Installed');
// e.waitUntil Delays the event until the Promise is resolved
e.waitUntil(
// Open the cache
caches.open(cacheName).then(function(cache) {
// Add all the default files to the cache
console.log('[ServiceWorker] Caching cacheFiles');
return cache.addAll(cacheFiles);
})
); // end e.waitUntil
});
self.addEventListener('activate', function(e) {
console.log('[ServiceWorker] Activated');
e.waitUntil(
// Get all the cache keys (cacheName)
caches.keys().then(function(cacheNames) {
return Promise.all(cacheNames.map(function(thisCacheName) {
// If a cached item is saved under a previous cacheName
if (thisCacheName !== cacheName) {
// Delete that cached file
console.log('[ServiceWorker] Removing Cached Files from Cache - ', thisCacheName);
return caches.delete(thisCacheName);
}
}));
})
); // end e.waitUntil
});
self.addEventListener('fetch', function(e) {
console.log('[ServiceWorker] Fetch', e.request.url);
// e.respondWidth Responds to the fetch event
e.respondWith(
// Check in cache for the request being made
caches.match(e.request)
.then(function(response) {
// If the request is in the cache
if ( response ) {
console.log([ServiceWorker] Found in Cache, e.request.url, response);
// Return the cached version
return response;
}
// If the request is NOT in the cache, fetch and cache
var requestClone = e.request.clone();
fetch(requestClone)
.then(function(response) {
if ( !response ) {
console.log([ServiceWorker] No response from fetch )
return response;
}
var responseClone = response.clone();
// Open the cache
caches.open(cacheName).then(function(cache) {
// Put the fetched response in the cache
cache.put(e.request, responseClone);
console.log('[ServiceWorker] New Data Cached', e.request.url);
// Return the response
return response;
}); // end caches.open
})
.catch(function(err) {
console.log('[ServiceWorker] Error Fetching & Caching New Data', err);
});
}) // end caches.match(e.request)
); // end e.respondWith
});
And registration of the SW (put in last in my html body)
<script type=text/javascript>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('service-worker.js');
};
</script>
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