QWebEngineView - loading html from resources

I am currently playing with QWebEngineView

in Qt 5.8 and I would like to load a file index.html

from my file .qrc

.

My file .pro

looks like this:

TEMPLATE = app
TARGET = Launcher
QT += webenginewidgets
CONFIG += c++14

SOURCES += main.cpp

RESOURCES += \
    launcher.qrc

      

        
        
        
      

    

My file main.cpp

looks like this:

#include <QApplication>
#include <QWebEngineView>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QWebEngineView view;
    view.load(QUrl("qrc:/html/index.html"));
    view.resize(1024, 768);
    view.show();

    return a.exec();
}

      

        
        
        
      

    

My project has a file launcher.qrc

:

<RCC>
    <qresource prefix="/html">
        <file>index.html</file>
    </qresource>
</RCC>

      

        
        
        
      

    

Inside, index.html

I just added the text Hello World

without any others.

When I run the application, I just get a "Website not re-running" error screen.
Then I googled and tried several different attempts to specify the resource url for mine QWebEngineView

:

view.setUrl(QUrl("qrc:/html/index.html")); // Same error page
view.page()->setUrl(QUrl("qrc:/html/index.html")); // Same error page
view.page()->load(QUrl("qrc:/html/index.html")); // Same error page

      

        
        
        
      

    

If I change the resource url from qrc:/html/index.html

to :/html/index.html

, I no longer receive this error page other than a blank page. If I then touch the window and select View Page Source, the page source is also empty.

I recently got this working with a fresh Qt Quick Application built with Qt Creator 4.2.2 using the same url qrc:...

.
Now I have created a Qt Widgets app and it doesn't work anymore.
What am I missing here?