[fetch] Handling of empty bodies (#246)

Currently the spec says that `new Response("")` and `new Response(new FormData()`) is handled different from `new Response()`. All three generate a Response with an empty body, but the first two also set the `content-type` header.

Is this intentional? Does it really make sense to set the `content-type` header even if no body is set?

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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/246