Re: [fetch] `user-agent` header control (#37)

I think we 'inherited' User-Agent from a list of headers Flash disallowed changing in its implementation. There was some speculation that some services might exist that only allowed specific customized browsers to access them, using UA string as a sort of auth token, but I don't think anybody ever found a real-life case of such a system. (Obviously it would be astonishingly poor design).

Personally, I think we can and should drop User-Agent from the list of headers you're not allowed to set.

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