iOS: network connection not properly detected when using https

When no data connection is available, and wifi is turned off or on but not connected, the lack of connection is not properly seen. Requests sent to a server are not properly made as the server does not send any reply to them. One should expect network error reply.

Can be reproduced using the devdays app:
https://codereview.qt-project.org/#/admin/projects/qt-labs/talk-schedule