QNetworkAccessManager HTTP Put request not working

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;
 }