Re: [ServiceWorker] Consider relying on eTags (or other headers) for service worker dependencies to check for updates (#839)

If the request is made with `If-Modified-Since` or `If-None-Match`, and the response is `200`, we could assume this is a new SW even if it's byte identical. Although this would cause unnecessary service worker updates on servers that send out `Etag` or `Last-Modified` but don't correctly return `304`.

Else we just add `Service-Worker-Force-Update: 1` or something.

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https://github.com/slightlyoff/ServiceWorker/issues/839#issuecomment-187675396