Re: [whatwg/fetch] Header to opt out of opaque redirect (#601)

In our specific case, the navigation preload request, is being DOS blocked and redirected to a CAPTCHA page. However the preload response resolves to a response with  type "opaqueredirect" and no access to the redirect url (sent back in the Location: header).The server which performs the DOS block is not under our control and happens upstream.

While we can work around this specific case, it might be easier if ServiceWorker code on the client, has access to the redirect URL for error handling and recovery.

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