3. Caching

kawazoe/force-reload.js

https://gist.github.com/kawazoe/fa3b5a3c998d16871ffb9e2fd721cb4b

ServiceWorkerGlobalScope API: skipWaiting

https://caniuse.com/#feat=mdn-api_serviceworkerglobalscope_skipwaiting

Test on Heroku

https://pwa-times.herokuapp.com

What self.skipWaiting() does to the service worker lifecycle

https://bitsofco.de/what-self-skipwaiting-does-to-the-service-worker-lifecycle/

Workbox

https://developers.google.com/web/tools/workbox/