Caching Considerations and Best Practices

There are some best practices to consider for caching. These will help to prevent errors and optimize the implementation of caching.

Should we cache the service worker itself?

It’s a best practice not to add the service worker file to the cache. When we register a service worker, the browser installs it for our PWA. The browser uses a separate facility for caching and managing service workers. It’s not our responsibility to cache it.

While testing the PWA offline, the browser produces an error in the console when it tries to retrieve our sw.js file. That’s nothing to be concerned about because if the new worker fails to parse, it’s thrown away, and the current service worker remains active.