https://www.nakopci.com/sw.js

1const offlineUrl = '/offline'
2
3self.addEventListener('install', function(event) {
4    const offlineRequest = new Request(offlineUrl)
5    event.waitUntil(
6        fetch(offlineRequest).then(function(response) {
7            return caches.open('offline').then(function(cache) {
8                console.log('[oninstall] Cached offline page', response.url)
9                return cache.put(offlineRequest, response)
10            })
11        })
12    )
13})
14
15self.addEventListener('fetch', function(event) {
16    const request = event.request
17
18    if (request.url.match(/\.(css|jpg|jpeg|png|gif|js|woff|woff2|ttf|svg|mp4|webp)$/) || request.url.indexOf(request.referrer) !== 0) {
19    } else if (request.method === 'GET') {
20        event.respondWith(
21            fetch(request).catch(function(error) {
22                console.log('[onfetch] Failed. Serving cached offline fallback ' + error)
23                return caches.open('offline').then(function(cache) {
24                    return cache.match(offlineUrl)
25                })
26            })
27        )
28    }
29})