https://community.engagement-global.de/sw.js?v=1790088987

1            var OFFLINE_PAGE_URL = '/offline.pwa.html';
2
3            self.addEventListener('install', function (event) {
4                console.log('********** The service worker is being installed.');
5
6                // Store "Offline" page
7                var offlineRequest = new Request(OFFLINE_PAGE_URL, {init: {
8                    credentials: 'omit'
9                }});
10
11                event.waitUntil(
12                    fetch(offlineRequest).then(function (response) {
13                        return caches.open('offline').then(function (cache) {
14                                console.log('[oninstall] Cached offline page', response.url);
15                                return cache.put(offlineRequest, response);
16                            });
17                    })
18                );
19            });