Solved 
Is very easy. Thank You for all helpful reply
QUrl url
("http://192.168.1.109/ask.cgi");
QUrlQuery query;
query.setQuery("json={\"ctrl\":{\"c":\"gd\",\"i\":6}}");
url.setQuery(query);
QNetworkRequest req(url);
QNetworkAccessManager test;
connect(&test, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit()));
QNetworkReply * reply = test.get(req);
loop.exec();
QUrl url("http://192.168.1.109/ask.cgi");
QUrlQuery query;
query.setQuery("json={\"ctrl\":{\"c":\"gd\",\"i\":6}}");
url.setQuery(query);
QNetworkRequest req(url);
QNetworkAccessManager test;
QEventLoop loop;
connect(&test, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit()));
QNetworkReply * reply = test.get(req);
loop.exec();
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