Re: [whatwg/fetch] Provide opt-in for Expect = "100-continue" (#41)

Even without the teeing optimization, supporting Expect: 100-continue could be useful for large requests, in particular file uploads. The server may be able to respond immediately with an error (like a 401 or 403), meaning that clients for whom network usage is important (mobile in particular) can avoid wasting network on a request whose body will be ignored.

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