Re: [ServiceWorker] A header/something to kill SWs (#614)

Sorry that wasn't clear. My idea was in the Update algorithm, do a HEAD request before fetching the script. The HEAD request could be done every time, or else limited by something like once every hour (similar to how fetching the script bypasses the cache only once every 24 hours). Update can be invoked via by SoftUpdate, which the UA can run at anytime (Chrome schedules one to happen soon after every navigation to a page in scope).

In Chrome's case, I think it shouldn't be too battery/network costly since you're already hitting network by navigating to the site.

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https://github.com/slightlyoff/ServiceWorker/issues/614#issuecomment-75708134