Re: [whatwg/fetch] Clarify response's url list state when parsing a 3xx response's Location header value (#631)

Thanks, you found a bug. 😊

If we used the request's current url instead I think we'd be okay, except when the service worker returns an "opaqueredirect", but in that case I think we should be returning early and skip the redirect processing as it has already happened.

So I think we need to make two changes:

1. Use request's current url as base URL for redirects.
2. Add step 3.2.5: 'If response's type is "opaqueredirect", then return response.'

Would you like to be acknowledged as Harris Hancock?

@wanderview @yutakahirano @jakearchibald could you please review the above?

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