Re: [ServiceWorker] HTTP authentication and proxy authentication hook (#119)

@domenic I think my new way of thinking about `fetch()` is that it does fetching the same way XMLHttpRequest et al approach it, but that you can opt-out of the "magic". E.g. in this case by setting client/dialogWindow to null. (Of course, as @sleevi indicates not all "magic" can be handled by JavaScript, but simple HTTP authentication flows certainly can, and I agree would indeed be better.)

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