Re: [whatwg/fetch] Redirect on preflighted CORS requests generally impossible (#204)

Okay, so what I missed was that Fetch does copy this restriction after all, by setting redirect mode to "error".

@youennf pointed this out in https://github.com/whatwg/fetch/issues/198#issuecomment-236925202.

So I'm going to reopen this and then I'm going to change Fetch to not do that since we have since determined that it is secure. And with the upcoming origin-wide CORS preflights it will be relatively cheap to have redirects that require a preflight.

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