[Webkit-unassigned] [Bug 213726] New: fetch fails only when site/pwa is added to homescreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213726

            Bug ID: 213726
           Summary: fetch fails only when site/pwa is added to homescreen
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mustafa.0x at gmail.com

I have a PWA (http://app.turath.io) that loads a JSON file from another subdomain.

This works fine in Safari iOS, but it fails once I add the site to homescreen.

The error message:
> Fetch API cannot load https://files.turath.io/data.json due to access control checks.
> Failed to load resource: Preflight response is not successful

This only recently broke.

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