VirtualCam

static/sw.js

@@ -0,0 +1,45 @@
+// Minimal service worker: cache the app shell so site is quickly available and installable.
+const CACHE_NAME = 'phone-webcam-v1';
+const FILES_TO_CACHE = [
+  '/',
+  '/manifest.json',
+  '/static/index.html',
+  '/static/index.html', // duplicated intentionally harmless
+  '/static/icon-192.png'
+];
+
+self.addEventListener('install', (evt) => {
+  evt.waitUntil(
+    caches.open(CACHE_NAME).then(cache => cache.addAll(FILES_TO_CACHE))
+  );
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (evt) => {
+  evt.waitUntil(
+    caches.keys().then(keys => Promise.all(
+      keys.map(k => { if (k !== CACHE_NAME) return caches.delete(k); })
+    ))
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (evt) => {
+  // network-first for /offer (dynamic), cache-first for app shell assets
+  const url = new URL(evt.request.url);
+  if (url.pathname === '/offer') {
+    // passthrough to network
+    evt.respondWith(fetch(evt.request));
+    return;
+  }
+
+  evt.respondWith(
+    caches.match(evt.request).then(cached => cached || fetch(evt.request).then(resp => {
+      // optionally cache dynamic responses here
+      return resp;
+    }).catch(() => {
+      // fallback could be a blank response for image or offline page
+      return caches.match('/');
+    }))
+  );
+});