more pwa stuff

public/service-worker.js

@@ -30,16 +30,17 @@ self.addEventListener("fetch", event => {
   event.respondWith(
     fetch(event.request)
       .then(response => cache(event.request, response))
-      .catch(function() {
-        return caches.match(event.request);
-      })
+      .catch(() => caches.match(event.request))
   );
 });
 
 function cache(request, response) {
-  //console.log(response.type === "error" || response.type === "opaque", request);
-  if (response.type === "error" || response.type === "opaque") {
-    return response;
+  if (
+    response.type === "error" ||
+    !(response.url.includes("http:") && response.url.includes("https:")) ||
+    response.url == ""
+  ) {
+    return Promise.resolve(response);
   }
 
   return caches.open(CACHE_NAME).then(cache => {