How to debug a QNetworkRequest with a QHttpMultiPart posted by QNetworkAccessManager?

SeDi

Hi,
I am new to using QNetwork* things. I am trying to use an API and I am not sure, what the actual output of my QNetworkRequest looks like. (Qt 5.15.2, Windows)

m_manager->post(QNetworkRequest(url), multiPart);
qDebug()<<multiPart;

doesn't show any content.

In case it might be helpful, here's my code so far.
In the class constructor I create an instance for the Manager and connect it to a reply slot:

m_manager = new QNetworkAccessManager(); 
    connect(m_manager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(replyFinished(QNetworkReply*)));

The reply slot is simple:

void MainWindow::replyFinished(QNetworkReply *reply)
{
    qDebug() << "request finshed, reply receveid";
    qDebug() << reply->error(); 
    QByteArray data=reply->readAll();
    qDebug() << data;
 }

Then I assemble a request:

void MainWindow::sendARequest()
{
    QString productCode = "7374698765439";
    QString fieldContent = "MyFoodNameForTestingReasons";
    if(!m_manager) {
        qDebug() << "no network manager avaible";
        return;
    }
    //QUrl url("http://off:off@world.openfoodfacts.net/cgi/product_jqm2.pl");
    QUrl url("http://world.openfoodfacts.net/cgi/product_jqm2.pl");
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QHttpPart barcodePart;
    barcodePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"code\""));
    barcodePart.setBody(productCode.toUtf8());

    QHttpPart usernamePart;
    usernamePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"user_id\""));
    usernamePart.setBody(QString("off").toUtf8());

    QHttpPart passwordPart;
    passwordPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"password\""));
    passwordPart.setBody(QString("off").toUtf8());

    QHttpPart fieldPart;
    fieldPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"product_name\""));
    fieldPart.setBody(fieldContent.toUtf8());

    multiPart->append(barcodePart);
    multiPart->append(usernamePart);
    multiPart->append(passwordPart);
    multiPart->append(fieldPart);

/// HERE I'd like to know the actual "outgoing" request, just as it is going to be posted.
    qDebug()<<multiPart;
    
    m_manager->post(QNetworkRequest(url), multiPart);
        }

SGaist

Hi,

You are getting a pointer value since your QHttpMultPart is allocated on the heap.

You can use a tool like Wireshark to inspect what is going on or a service like RequestBin to inspect your request.