[Webkit-unassigned] [Bug 233640] New: passthrough service workers should respect redirects when propagating navigation origin header

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233640

            Bug ID: 233640
           Summary: passthrough service workers should respect redirects
                    when propagating navigation origin header
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ben at wanderview.com

Please see:

https://github.com/whatwg/fetch/pull/1345

Webkit already implements part of this spec change.  Specifically, it seems to propagate the requests origin for passthrough service workers that do `evt.respondWith(fetch(evt.request))`.

It does not, however, correctly set the origin header to `origin:null` if the FetchEvent.request is a navigation that redirected through a cross-origin URL.

The WPT tests for this change are at:

https://wpt.fyi/results/service-workers/service-worker/navigation-headers.https.html?label=experimental&label=master&aligned

Many of the failures there are for things not implemented by webkit yet and can be ignored.  The failures that matter for this bug are the test cases:

* "POST Navigation, same-origin with same-site redirect and passthrough service worker sets correct origin and referer headers."
* "POST Navigation, same-origin with cross-site redirect and passthrough service worker sets correct origin and referer headers."
* "POST Navigation, same-origin with cross-site redirect, same-origin redirect, and passthrough service worker sets correct origin and referer headers."

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