QNetworkAccessManager HTTP Put request not working - qt

Question

After an exhaustive search on the web about this issue, none of the answers found solved it.
Using the technology Qt_5_15_2_MSVC2019_64/Microsoft Visual C++ Compiler,
I'm trying to send a JSON file through HTTP put request from QNetworkAccessManager to a custom QTcpServer, but when doing so, only HTTP headers are received (even twice) but not the JSON file in itself.
Snippet Code:
void Sender::putParameters(const QString& p_parameters) {
QJsonDocument docJson = QJsonDocument::fromJson(p_parameters.toUtf8());
QByteArray data = docJson.toJson();
QUrl url= QUrl("http://127.0.0.1:80/api/devices/1285/parameters");
QNetworkAccessManager* nam = new QNetworkAccessManager(this); // Even tried to put as member variable but still did not work
QNetworkRequest networkReq(url);
networkReq.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
networkReq.setRawHeader("Content-Length", QByteArray::number(data.size()));
QObject::connect(nam, &QNetworkAccessManager::finished, this,
&Sender::validateParameters);
nam->put(networkReq, data);
if(docJson.isEmpty())
qDebug() << "JSON was empty";
}
Result QTcpServer:
With Poco library there's no issue it works, or sending HTTP put request via Postman it does work.

Answer 1

#dabbler
Sorry for the late answer but here is the code snippet of the Server :
enter image description here
With postMan and Poco it's working perfectly, so I don't know if the issue is then related to the server, and for the client side #Dmitry you're right I should use QJsonDocument::isNull instead (but I used isEmpty() just for demonstration purpose that I wasn't sending an invalid Json which is not the case, the json is valid).

Answer 2

Yes my bad #Syfer
So I have the class Server inheriting from QTcpServer and overriding function incomingConnection such as : void incomingConnection(qintptr) Q_DECL_OVERRIDE;
Here is the code snippet:
Server::Server(QObject* parent) : QTcpServer(parent)
{
if(listen(QHostAddress::Any, 80))
qDebug() << "Ok listening port 80";
else
qCritical() << "Fail listening";
}
void Server::incomingConnection(qintptr p_intPtrSocket)
{
QTcpSocket* socketClient = new QTcpSocket(this);
socketClient->setSocketDescriptor(p_intPtrSocket);
connect(socketClient, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
}
void Server::onReadyRead()
{
QTcpSocket* socketClient = (QTcpSocket*)sender();
QString fullClientRequest = QString::fromUtf8(socketClient->readAll());
QStringList clientReq = fullClientRequest.split("\n");
qDebug() << "client response: " << clientReq;
}