Solved. Just started compiling 5.4.2 and just small issues that are easier to resolve.

@Leonardo Yeah, that works. Thank you.

@mcosta Thanks mcosta

Yes, indeed I can show website over https with WebEngine, even though it still show those warning messages. As documented here, Web Kit will be deprecated in Qt version 5.5+, so I'll switch to use WebEngine then.

For those who feel annoyed with the warning messages, you could suppress them by calling following method in your main()

QLoggingCategory::setFilterRules("qt.network.ssl.w arning=false");

or by setting environment variable

QT_LOGGING_RULES=qt.network.ssl.warning=false

@SGaist Thank you for the reply. But I am a newbie here and don't know anything. So can you please send me download link for whichever of "Visual Studio 2013" and "Qt's MinGW version" is a smaller file to download.
Or is there any other way so that I need to download minimum data.

That was a long time ago, but I was using Visual Studio.
Anyway the release for Windows Phone was postponed, so maybe in a new Qt version it works, not sure.

Did you compile release version with no problem?

I have created a bug for this and will see where it goes from there.

QTBUG-45459