I've been using manifest.appcache to cache my apps for a while, and was working great. Later I read Google suggestion to cache with service worker, so they can

I've been using manifest.appcache to cache my apps for a while, and was working great. Later I read Google suggestion to cache with service worker, so they can prompt the user about installing your app, but it doesn't work that great. Some times the sw.js won't load. And when it loads, it ignores the manifest.