How to set User Agent in QtWebEngine QML application

[joelmar]

NOTE: I was able to do that on QtWebKit QML using the QtWebView extension. Here I am interested in using QtWebEngine.

My simple test application

    import QtQuick 2.1
    import QtQuick.Controls 1.1
    import QtWebEngine 1.0
    
    ApplicationWindow {
        width: 800
        height: 600
        color: "lightgray"
        visible: true
        WebEngineView {
            id: webview
            url: "http://forum.qt.io/"
            anchors.fill: parent
        }
    }

How do I pass a different User Agent string?