Hi

Try this

Qt Code: 
  1. Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
  2. {
  3.     ui->setupUi(this);
  4.     http   = new QHttp;
  5.     chart  = new QByteArray;
  6.     QHttpRequestHeader header("POST", "/chart?cht=p3&chf=bg,s,65432100&chd=t:60,40&chs=250x100&chl=Hello|World");
  7.     header.setValue("Host","chart.apis.google.com");
  8.     http->setHost("chart.apis.google.com");
  9.     http->request(header, *chart); 
  10.     QApplication::processEvents();
  11.     connect(http, SIGNAL(done(bool)), this, SLOT(showChart()));
  12. }
  13.  
  14. void Widget::showChart()
  15. {
  16.     *chart = http->readAll();
  17.     QPixmap chartPixmap;
  18.     chartPixmap.loadFromData(*chart);
  19.     ui->label->setPixmap(chartPixmap);
  20. }
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Greetings!