[Webkit-unassigned] [Bug 282427] New: Service Worker can't correctly redirect relative URLs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282427

            Bug ID: 282427
           Summary: Service Worker can't correctly redirect relative URLs
           Product: WebKit
           Version: Safari 18
          Hardware: Mac (Apple Silicon)
                OS: macOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: berislav.grgicak at gmail.com
                CC: youennf at gmail.com

Created attachment 473100

  --> https://bugs.webkit.org/attachment.cgi?id=473100&action=review

Error in the network request

When I use a Service Worker for 300 redirects it works well when the Location header is set to an absolute URL like http://localhost/redirect.html, but the request returns an error when I set the location header to a relative URL like /redirect.html.

Relative URL redirects work in both Firefox and Chrome, just not in Safari.

If a relative URL location header is returned by a server like Apache the redirect will work. This is why I assume the issue is specifically related to Service Workers. 

Here is a repository with a minimal example of the issue https://github.com/bgrgicak/service-worker-redirect-test and testing instruction.

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