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

You can do this already by passing a promise to respondWith that you later resolve, no? The reason this works this way is the event model. If you don't reply to the event, we'll go to the network.

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https://github.com/slightlyoff/ServiceWorker/issues/836#issuecomment-186270445