[Webkit-unassigned] [Bug 235710] New: redirectCount returns 0 when using a Service Worker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235710

            Bug ID: 235710
           Summary: redirectCount returns 0 when using a Service Worker
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daniel.schulz at baqend.com

Created attachment 450130

  --> https://bugs.webkit.org/attachment.cgi?id=450130&action=review

All the files referenced in the bug report

The Redirect Counter of the Performance API returns 0 after a redirect, when having a Service Worker installed.
I've hosted the code in a test environment and attached everything in a zip as well.
Tested in Safari 15.2 and 15.4TP on MacOS 12.1 on a MacBook Pro M1 2020.


Steps to Reproduce

1)
- Go to https://sw-lifecycle-test.app.baqend.com/v1/code/redirect
- this redirects to https://sw-lifecycle-test.app.baqend.com/redirectTest/redirect.html
- on redirected site, execute in console:
        performance.navigation.redirectCount // returns 1
- This is the expected behaviour

2)
- Go to https://sw-lifecycle-test.app.baqend.com/redirectTest/test.html
- this installs a SW and redirects to https://sw-lifecycle-test.app.baqend.com/redirectTest/redirect.html
- on redirected site, execute in console:
        performance.navigation.redirectCount // returns 0
- This is unexpected behaviour. It should return 1.

3)
Repeat step 1)
- performance.navigation.redirectCount // still returns 1

4)
Uninstall Service Worker, Repeat 1)
- performance.navigation.redirectCount // returns 0 again

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