I wrote a simple PWA (current version) based on this tutorial by Vaadin. It works fine, tested in Chrome, also in offline mode.
By using it on a mobile device, issues occur:
I thought that is, what the PWA is good for? Why does it not load the static assets? I think my service-worker is just fine:
const staticAssets = [
'./',
'./styles.css',
'./app.js',
'./images',
'./fallback.json',
'./images/system/offline.png'
]
self.addEventListener('install', async event => {
const cache = await caches.open('static-assets');
cache.addAll(staticAssets);
});
self.addEventListener('fetch', event => {
const req = event.request;
const url = new URL(req.url);
if(url.origin === location.origin){
event.respondWith(cacheFirst(req));
}else{
event.respondWith(networkFirst(req));
}
});
async function cacheFirst(req){
const cachedResponse = await caches.match(req);
return cachedResponse || fetch(req);
}
async function networkFirst(req){
const cache = await caches.open('dynamic-content');
try{
const res = await fetch(req);
cache.put(req, res.clone());
return res;
}catch(err){
const cachedResponse = await cache.match(req);
return cachedResponse || caches.match('./fallback.json');
}
}
I'm happy to share more code, if you think the problem is somewhere else!
The problem was within the service-worker:
I forgot to add the service worker file to the static assets.
Found the solution by reading the answers of this question: https://stackoverflow.com/a/44482764/7350000.