does HTTP extension work in plasma qml?

[bruce]

i have wrote a little plasma-qml applet.i try to utilize HTTP extension from 
plasma-javascript to retreive web resources. but plasmoid.getUrl() returned 
undefined. in plasma-javascript works well.
i have pasted the main.qml code into paste.kde.org, link follows:
http://paste.kde.org/p1f0f7ab5/

the attachment is the whole project zip file.


i have add line X-Plasma-RequiredExtensions=LaunchApp,HTTP in this qml 
plasmoid metadata.desktop
is HTTP extension available in QML?

expecting for your reply.
thanks advance!
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