Re: [whatwg/fetch] Optional disable setting headers keys in lowercase (#304)

So in gecko we actually normalize standard headers to a mixed case form in our network stack.  If the header matches one of these in a case-insensitive comparison, then we send the atomize header string:

https://dxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/nsHttpAtomList.h

We probably keep the case of the first new header added as well to use an atom for later matching headers.

Not sure how much of this we can easily change without fear of breaking servers.  FYI in case that changes plans here at all.

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