Re: [whatwg/fetch] Only-if-cached (#159)

Yeah, "only-if-cached" would give extremely precise results whether the target URL has been visited at some point by the user.

I think we would not support cached redirects for this feature so that would return a network error. I guess we don't need to require a particular mode then, either the URL is same-origin and in the cache, or it's a network error. The advantage of requiring a particular mode though might be that we can then more easily expand this feature by allowing more modes going forward, that would now just throw when used. Thoughts?

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