Bug 213726

Summary:	fetch fails only when site/pwa is added to homescreen
Product:	WebKit	Reporter:	mustafa.0x
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Major	CC:	ap, hosskhalifa, katherine_cheney, webkit-bug-importer, wilander, youennf
Priority:	P2	Keywords:	InRadar
Version:	Safari 13
Hardware:	iPhone / iPad
OS:	iOS 13

Description mustafa.0x 2020-06-29 07:18:54 PDT

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.

Comment 1 Hossameldin 2020-06-29 18:10:44 PDT

I have a similar situation 
Very important to fix

Comment 2 mustafa.0x 2020-06-30 15:46:42 PDT

Note: I updated the service worker to ignore this fetch, and that *seems* to have fixed the issue.

If so, the bug is with the sw's proxying.


The change I made to the service worker:
 self.addEventListener('fetch', e => {
+    if (e.request.url === 'https://files.turath.io/data.json')
+        return;
     e.respondWith(caches.match(e.request).then(r => r || fetch(e.request)));
 });

Comment 3 Radar WebKit Bug Importer 2020-07-05 14:00:02 PDT

<rdar://problem/65110679>