How to Detect and Handle Errors Only from refetchOnWindowFocus?

[DylanJu]

I'm encountering an issue with refetchOnWindowFocus that I need help with.

In an iOS webview environment, when a query is refetched on window focus, a browser network error occasionally occurs. This happens because, at the OS level, the webview restricts network access if it has been in the background for a certain period of time. This behavior cannot be detected through browser APIs, and thus neither navigator.onLine nor addEventListener('online' | 'offline', callback) can catch this.

I would like to ignore such errors if cacheData is available. How can I handle this using useQuery?

[TkDodo]

we don't track what initiated the fetch, so I'm afraid there isn't much to cling onto.