[jeroenhd]

This API is pretty useful for writing web apps that also work offline/with bad connectivity. It saves you from re-implementing the browser fetching/resource loading logic the browser already does for you.

It's very powerful, which also makes it a footgun: you can end up with fetch() requests going out over the network, with server responses saying one thing, but the frontend receiving something completely differently.

As for examples, I believe Home Assistant uses it to cache pretty much every resource in the frontend pre-emptively so you can use the web UI even if your internet connection is down (but your connection to your home server isn't).

[arm32]

We use service workers extensively in the kiosk app world.