fix(pwa): 🐛 don't serve errored resources in service worker proxy

src/serviceworker/mod.ts

@@ -90,7 +90,9 @@ async function fetchHandler(event: FetchEvent) {
 	// Cache first for "pre-cached-urls"
 	if (preCachedUrls.includes(url.pathname) && method === 'GET') {
 		const cached = await cache.match(event.request) ??
-			await fetch(event.request).catch(() => null) ??
+			await fetch(event.request).then((response) =>
+				response.ok ? response : null
+			).catch(() => null) ??
 			await cache.match(event.request, { ignoreSearch: true })
 
 		if (cached === undefined) {
@@ -105,7 +107,12 @@ async function fetchHandler(event: FetchEvent) {
 
 		const response = fetch(event.request)
 			.then((response) => {
-				// Update cache
+				if (!response.ok) {
+					throw new Error(
+						`failed to get request: [${response.status}] ${response.statusText}`,
+					)
+				}
+				// Update cache if ok
 				cache.put(event.request, response.clone())
 				return response
 			})