Re: [whatwg/fetch] Listing headers safe only for certain values is a bad idea (#313)

I think enforcing a server to list all acceptable values concretely for each field (no wildcard) in preflight would be definitely effective. [Origin policy](https://mikewest.github.io/origin-policy/) might reduce its cost. But still non realistic for covering body and URL path and query.

But then, we again lead to (1) or (2) above.

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