How to check working proxy

[Zain]

Hello all,

I need to create an application, which will take a list of proxies with socket.
I need to check which is working and which is dead.

I have tried to set proxy in web view control.

@
QNetworkProxy proxy;

    proxy.setHostName(myproxy);        
    proxy.setPort(myPort);
    QNetworkProxy::setApplicationProxy(proxy);

    QNetworkAccessManager* manager = new QNetworkAccessManager ();

    req.setUrl(QUrl(myUrl));
    manager->setProxy(proxy);

     ui->webView->page()->setNetworkAccessManager(manager);
      ui->webView->load(req);

@

But it didn't set the proxy of web view.(I tried opening some sites which tell your ip and proxy...but the shon my original ip and no proxy )

I have also tried:

@
ui->webView->page()->networkAccessManager()->setProxy(proxy);
ui->webView->setUrl(QUrl(myUrl));

@

but didn't make any difference.
It always returns results even I have used a dead proxy.
Am I missing some thing.

Please help, any suggestion appreciated.

Thanks
Zain