How do I connect a QTcpSocket to a TOR .onion site?

[csoler]

I would like to test that an .onion site ran by TOR is actually up, using Qt. So what I do is:

QNetworkProxy proxy;
	proxy.setType(QNetworkProxy::DefaultProxy);
	proxy.setHostName("127.0.0.1");
	proxy.setPort(9050);
	proxy.setCapabilities(QNetworkProxy::HostNameLookupCapability | proxy.capabilities()) ;
 
	QTcpSocket socket ;
	socket.setProxy(proxy) ;
 
	socket.connectToHost("ulno4bbebwsr23n6.onion",9023);
 
	if(!socket.waitForConnected(5000))
             std::cerr << "Error: " << socket.errorString().toStdString() << std::endl;

QNetworkProxy proxy;
	proxy.setType(QNetworkProxy::DefaultProxy);
	proxy.setHostName("127.0.0.1");
	proxy.setPort(9050);
	proxy.setCapabilities(QNetworkProxy::HostNameLookupCapability | proxy.capabilities()) ;

	QTcpSocket socket ;
	socket.setProxy(proxy) ;

	socket.connectToHost("ulno4bbebwsr23n6.onion",9023);

	if(!socket.waitForConnected(5000))
             std::cerr << "Error: " << socket.errorString().toStdString() << std::endl;

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But what I get is an error message in the console that says "Error: Host not found". Apparently the proxy is not able to resolve the .onion address.

I tried Socks5Proxy, but that causes "Error: Operation on socket is not supported". So I suppose I should stick to the DefaultProxy type.

I'm 100% sure the onion site is alive and running. So what's wrong in my code??

Thanks in advance for any help!

[csoler]

I'm answering to myself, since I found it: the url should be "http://[...].onion", not just simply "[...].onion". Then it works.