Re: [ServiceWorker] Allow respondWith() to be called asynchronously or allow some way to cancel the response. (#836)

Upon further thought, I was wrong about waitUntil() requiring coordination.  Since waitUntil() promises basically get passed to Promise.all(), no middleware is necessary to do that.

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https://github.com/slightlyoff/ServiceWorker/issues/836#issuecomment-186611060