Re: [ServiceWorker] spec should be more explicit about accessing internal body on opaque Responses (#710)

Pretty sure this behavior has been in the spec for a long time, @annevk.  We definitely honor it in gecko:

  https://dxr.mozilla.org/mozilla-central/source/dom/cache/Manager.cpp#501

The rational is if you do a HEAD request to a cross-origin server without CORS, you still get a response without a body.  The Cache API should behave the same.

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