v0.14.22

web/js/sw.js

@@ -6,8 +6,28 @@ self.addEventListener('install', event => event.waitUntil(caches.open(CACHE).the
 self.addEventListener('activate', event => event.waitUntil(caches.keys().then(keys => Promise.all(keys.filter(key => key !== CACHE).map(key => caches.delete(key)))).then(() => self.clients.claim())));
 self.addEventListener('fetch', event => {
   const url = new URL(event.request.url);
-  if (event.request.method !== 'GET' || url.pathname.startsWith(path('/api/')) || url.pathname.startsWith(path('/lang/')) || event.request.mode === 'navigate') return;
-  event.respondWith(caches.match(event.request).then(cached => cached || fetch(event.request).then(response => {
-    const copy = response.clone(); caches.open(CACHE).then(cache => cache.put(event.request, copy)); return response;
-  })));
+  if (
+    event.request.method !== 'GET'
+    || (url.protocol !== 'http:' && url.protocol !== 'https:')
+    || url.origin !== self.location.origin
+    || url.pathname.startsWith(path('/api/'))
+    || url.pathname.startsWith(path('/lang/'))
+    || event.request.mode === 'navigate'
+  ) return;
+
+  event.respondWith((async () => {
+    const cached = await caches.match(event.request);
+    if (cached) return cached;
+
+    const response = await fetch(event.request);
+    if (response.ok && response.type === 'basic') {
+      try {
+        const cache = await caches.open(CACHE);
+        await cache.put(event.request, response.clone());
+      } catch (_) {
+        // Cache failures must not break the network response.
+      }
+    }
+    return response;
+  })());
 });