CookieManager.instance.flush()

[EArminjon]

Is there an existing feature request for this?

• I have searched the existing feature request

Operating System

Android

Pain

I've the same issue as react-native-webview/react-native-webview#1345.

If you remove a cookie in the web view and then kill the application in the recent application list on Android. When you launch again the application, the cookie is still here.
He does the same if you set a cookie and kill the app few seconds after, the cookie will not be here.
It seems ok on iOS.

Suggested solution

Adding a method to manually call Android getCookieManager().flush();

https://github.com/react-native-cookies/cookies/blob/69fe6557b0f2c286e6df6fa9100391ad2d163860/android/src/main/java/com/reactnativecommunity/cookies/CookieManagerModule.java#L96

A temporary solution is to delete a random fake cookie :

await CookieManager.instance().deleteCookie(url: WebUri('https://example.com'), name: 'i_need_to_call_flush');

This will call on Android getCookieManager().flush(); without regarding if deletion succeed or failed.

Useful resources

https://developer.android.com/reference/android/webkit/CookieManager#flush()

Additional information

Flutter 3.24

Self grab

• I'm ready to work on this issue!

[pichillilorenzo]

flush is already called when setting or deleting cookies on Android, for example:

flutter_inappwebview/flutter_inappwebview_android/android/src/main/java/com/pichillilorenzo/flutter_inappwebview_android/MyCookieManager.java

Line 363 in f67ae1f

cookieManager.flush();

Maybe the flush() method call should be moved inside the public void onReceiveValue(Boolean successful) { callback instead after the setCookie method call ??

[EArminjon]

Sorry, i was not enough precise.

The issue is present when a cookie is set or removed by a webpage (not by Flutter). In this case, if user kill the app few times after and relaunch it, cookie will not be here (in case of creation) or still be here (in case of deletion).

For example we have a scenario where when an users launch the app, they can see a webview to accept or not cookie "consent" (for tracking purpose). Once accepted or rejected we receive a postMessage from our webview to inform us to close the webview.
We detected this issue in this case : later, if user kill the app and relaunch it, consent is not persisted.

That's why we found calling .flush() before closing webview seems to well fix the issue.

[pichillilorenzo]

Ok, clear now, thanks! So then I will expose that method on Android as soon as possible 👍

[EArminjon]

You rock ! Ty so much !

[EArminjon]

Exposing flush() will be great and can help other future scenario on Android.

We got also the issue on iOS but this time we didn't have any suggestion / solution. I can create a dedicated issue if you want.

[pichillilorenzo]

iOS doesn't have any "flush()" method: https://developer.apple.com/documentation/webkit/wkhttpcookiestore

[EArminjon]

Yes, will create new issue for iOS, it will be clean.

[pichillilorenzo]

Released new version 6.2.0-beta.1.

[github-actions]

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