Re: [whatwg/fetch] Location header is the empty string (#669)

I think the URL parsing there is incorrect. The URL parser takes two parameters: _input_ and _base_. It is called with two arguments by Fetch: _location_ and _actualResponse_'s url. So you should parse the empty string relative to the base URL given by the response URL. So you get the response URL as the resulting returned URL (= _url_ inside the algorithm).

Of course by that reading I think we end up with an infinite redirect loop to itself, at least until the 20-redirect-limit is hit. So that seems like a spec bug too.

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