Typically, this code just works. Ever since implementing it, I have had no
issues at all when putting a device behind a network proxy — both HttpProxy and
HttpCachingProxy. Unfortunately, it is not working for a particular HttpProxy.
Here is the code:
qDebug() << "Detecting Proxy Settings";
QNetworkProxyQuery npq(QUrl("http://www.google.com";));
QList<QNetworkProxy> listOfProxies =
QNetworkProxyFactory::systemProxyForQuery(npq);
qDebug() << "LIST OF PROXIES SIZE: "<< listOfProxies.size();
qDebug() << "\n=====================\n";
for(int i=0; i< listOfProxies.size(); i++) {
qDebug() << "Proxy Type: " << listOfProxies[i].type();
qDebug() << "Proxy hostname:" << listOfProxies[i].hostName();
qDebug() << "Proxy port: " << listOfProxies[i].port();
qDebug() << "Is Caching Proxy? " << listOfProxies[i].isCachingProxy();
qDebug() << "Is Transparent Proxy? " <<
listOfProxies[i].isTransparentProxy();
qDebug() << "\n=====================\n";
}
if(listOfProxies.size() > 0) {
QNetworkProxy::setApplicationProxy(listOfProxies[0]);
} else {
QNetworkProxyFactory::setUseSystemConfiguration(true);
}
Here is the output:
[16:27:13]: DEBUG: Detecting Proxy Settings
[16:27:13]: DEBUG: LIST OF PROXIES SIZE: 1
[16:27:13]: DEBUG:
=====================
[16:27:13]: DEBUG: Proxy Type: 3
[16:27:13]: DEBUG: Proxy hostname: “proxy"
[16:27:13]: DEBUG: Proxy port: 8080
[16:27:13]: DEBUG: Is Caching Proxy? true
[16:27:13]: DEBUG: Is Transparent Proxy? true
[16:27:13]: DEBUG:
=====================
Shortly after the code above is executed, I preform a GET function against a
certain url:
NOTE: the url is accessible via a browser, so it is not being blocked.
QJsonDocument ServerCommunication::executeGET(QUrl url)
{
QNetworkReply* reply = _manager->get(QNetworkRequest(url));
qDebug() << "EXECUTEGET -- " << url.toDisplayString();
// Wait for the manager get function to finish
QEventLoop loop;
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
if(!reply->isFinished())
loop.exec();
QByteArray bytearray = reply->readAll();
if(bytearray.isNull() || bytearray.isEmpty()) {
qDebug() << "reply to GET ("+url.toString()+") is null or empty.";
} else {
qDebug() << "Successful GET("+url.toString()+")";
}
return QJsonDocument::fromJson(bytearray);
}
In the middle there, the loop.exec() starts executing and never finishes.
There are no credentials required for this proxy.
The device this runs on is on a client’s network and I have no access to
anything other than the device. I have requested that the client change the
proxy hostname to the ip address or fqdn but I am not sure whether that will
help.
Further information:
Qt5.5.1 – 32bit
OS – Windows Embedded Standard (7)
Thoughts?
-Jason
//------------------------------//
Jason R. Kretzer
Lead Application Developer
ja...@gocodigo.com<mailto:ja...@gocodigo.com>
//------------------------------//
“quidquid latine dictum sit altum videtur"
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