[Webkit-unassigned] [Bug 202142] Fix ServiceWorker downloads

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202142

--- Comment #9 from Jimmy Wärting <jimmy at warting.se> ---
I know for a fact that one way to keep the service worker alive is to keep sending postMessages every x second to it to prevent it from going idle.
(i think this is stupid and the spec should change it to allow it to stay open for longer: https://github.com/w3c/ServiceWorker/issues/980#issuecomment-486827233)

I have also read up in some issues in chromium bug and bugzilla that service worker should be alive for longer periods if it is holding a `FetchEvent.respondWith()` and the FetchEvent's window is still open.  If the FetchEvent's window is closed, the `respondWith()` keep alive should be revoked.

https://github.com/w3c/ServiceWorker/issues/882
https://bugzilla.mozilla.org/show_bug.cgi?id=1302715

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