Re: [fetch] Service worker request body reads need to invoke callbacks (#87)

I'm having a hard time wrapping my head around this one. We have a window/worker, a service worker, and the network stack. The document includes a request body in a fetch.

The service worker can decide to read this or pass it on.

Who gets notifications for read operations?

Note that for it to get from the document to the service worker, it likely had to be transfered. Might be the case for document to the network layer too, though.

@wanderview, any ideas?

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