Install the app in an Android 7+ and an iOS 10+ device (please test the issues in both devices). Try to add the site number 1 in my comment (comment is restricted). Check that you arrive to the credentials screen. Check that in iOS the URL written in the page has http protocol (not https). Check that in Android the URL has https (Android detects the certificate as valid, iOS doesn't).  In Android, enter a username and password (whatever you want). Check that you see a warning saying that the site has a redirect. Try to add the site number 2 in my comment. Check that you see an error "Cannot connect: ...". Try to add the site number 3 in my comment. In the credentials screen, enter a username and password (whatever you want). Check that you see a warning saying that the site has a redirect. Now install the app in an Android 4.4 (I'm not sure which version starts supporting fetch, but in emulator Android 4.4 doesn't support it). Repeat step 5 and check that you see an error in Hebrew.