Re: [w3c/ServiceWorker] The network fallback should be rejected when the request body is locked or disturbed (#1560)

If the service worker invokes `req.blob()` in Handle Fetch and then Handle Fetch ends up returning null to Fetch, Fetch holds a request whose body is disturbed. This is problematic as Fetch still needs that body. Therefore, similar to making an HTTP request (where you can have a similar situation if you encounter a redirect) it seems that Fetch will need to copy the request.

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