Re: [ServiceWorker] Define some way for foreign fetch to decide on opaqueness of responses (#841)

IMHO, visibility rules should be the same as those governing in the _fetch from network_ case, i.e. CORS headers. I really don't get the point of not using CORS.

If someone could clarify what does this means:
> Reusing CORS directly doesn't work, since we want CORS responses to become opaque responses by default.

I think responses for foreign fetch should not be different from already existent responses. For the client doing the request, it should not be distinguishable if the response comes from a sw handling a foreign fetch or from the network.

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https://github.com/slightlyoff/ServiceWorker/issues/841#issuecomment-189881293