minibrowser: net::ERR_CLEARTEXT_NOT_PERMITTED error with Android 9 (API 28)

If I launch minibrowser example compiled with targetSdkVersion="28", default qt.io page is not loaded with error net::ERR_CLEARTEXT_NOT_PERMITTED (screenshot attached).

If I use target api 27, there's no issue (apart from compatibility warning message box). http://qt.io is loaded and then redirected to https://.. later.

If http will stop working, that means QtWebChannel solutions will be broken, as you will not have https connection to your in-app websocket (who will provide valid https certificate for 127.0.0.1..?)!