[Webkit-unassigned] [Bug 232304] New: PWA doesn't work in offline mode intermittently - Restarting iPhone fixes it

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232304

            Bug ID: 232304
           Summary: PWA doesn't work in offline mode intermittently -
                    Restarting iPhone fixes it
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jander at mailinator.com

We have a PWA using a Service Worker, Application Cache and IndexedDB to provide offline functionality to our users.

This is the same PWA as bug https://bugs.webkit.org/show_bug.cgi?id=232302

We've found the following behaviour in an iPhone XR running iOS 14.8:

Intermittently, when using the PWA in offline mode, the standard Safari network error is displayed instead of our PWA's offline functionality.

Restarting the phone brings back the PWA in offline mode, without the need to go online, along with all saved data - So unlike the bug above, it doesn't look like the data is being evicted.

Our manifest.json file has "display" set to "minimal-ui", so the PWA displays in Safari instead of its own window.

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