Re: [whatwg/fetch] Header value definition needs work (#332)

I think what I recommend is that we strip any leading and trailing 0x09, 0x0A, 0x0D, and 0x20. So a single 0x0A would not make us throw. Then, if value still contains 0x00, 0x0A, or 0x0D, throw. Then pass it through to the server unchanged.

So a header value would be a byte sequence that does not have any leading or trailing HTTP whitespace bytes and does not contain 0x00, 0x0A, or 0x0D.

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