[Webkit-unassigned] [Bug 245425] New: [Regression] Service worker clientId is empty for web worker fetches in Safari 16

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245425

            Bug ID: 245425
           Summary: [Regression] Service worker clientId is empty for web
                    worker fetches in Safari 16
           Product: WebKit
           Version: Other
          Hardware: All
                OS: iOS 16
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Safari 16 has a regression where the Service Worker fetch event for a web worker has an empty clientId. It works correctly in Chrome and in Safari 15.

Minimal repro: https://downloads.scirra.com/labs/swworker/

Load the page. Reload it so the SW becomes active. In its fetch event it logs every fetch with its URL and clientId. Open dev tools for the service worker to see these logs.

In Safari 16+ the clientId is empty for the worker fetches. In Safari 15 and Chrome it sets the correct clientId.

This breaks a paid-for feature (Remote Preview) in our commercial web app Construct (www.construct.net). Please fix it ASAP.

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