Re: [whatwg/fetch] should fetch() allow no-cors cross-origin HEAD request? (#278)

I think the fetch spec has to handle this case because buggy servers send bodies for HEAD requests.  Gecko implements ignoring the body in this case:

  https://dxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/nsHttpTransaction.cpp#285
  https://dxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/nsHttpTransaction.cpp#1618

So I think fetch spec should do the same.

I'm less sure about Cache.match() now.  Gecko's http cache explicitly does NOT match a HEAD request against a non-HEAD request in the http cache.  If the request is a HEAD, then the http cache'd value must also be a HEAD.  I'm not sure what other implementations do there, though.

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