QHttpMultipart doesn't send the file part

[Antonio Ortiz]

Hi, I'm trying to upload an image file to a django restful api, the thing is that django replies with this:

 {
    "image": [
        "The submitted data was not a file. Check the encoding type on the form."
    ]
}

I follow the Qt documentation to create my multipart request, this is the code:

void Client::initForFile(QString url)
{
    responseStatus = false;

    request.setUrl(QUrl(url));
    request.setHeader(request.ContentTypeHeader, "multipart/form-data");
}

bool Client::post(QString url)
{
    url.replace("file://", "");
    file = new QFile(url);
    QFileInfo fileInfo(url);

    if(file->open(QIODevice::ReadOnly))
    {
        multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
        multiPart->setBoundary("----WebKitFormBoundary7MA4YWxkTrZu0gW");
        QHttpPart filePart;
        filePart.setHeader(QNetworkRequest::ContentDispositionHeader,
                           QVariant("form-data; name=\"image\""));
        filePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("form-data"));
        filePart.setHeader(QNetworkRequest::ContentTypeHeader,
                           QVariant("image/"+fileInfo.suffix().toLatin1()));

        filePart.setBodyDevice(file);
        file->setParent(multiPart);
        multiPart->append(filePart);

        rawResponse = manager->post(request,multiPart);
        connect(rawResponse, &QNetworkReply::finished,
                this, &Client::responseRecieved);

        multiPart->setParent(rawResponse);

        return true;
    }
    qDebug()<<file->errorString();

    return false;
}

is there something I'm missing?. I tried to upload the same image using Postman an it works.

[raven-worx]

@Antonio-Ortiz
i suggest you compare the (raw) working request with the non-working request from Qt using Fiddler or Wireshark for example.
This should lead quickly to the cause

[Antonio Ortiz]

@raven-worx said in QHttpMultipart doesn't send the file part:

request

Thanks for your quick reply, I'll try it

[raven-worx]

@Antonio-Ortiz said in QHttpMultipart doesn't send the file part:

filePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("form-data"));
filePart.setHeader(QNetworkRequest::ContentTypeHeader,
QVariant("image/"+fileInfo.suffix().toLatin1()));

also you are overwriting the ContentType header here

[Antonio Ortiz]

Thanks for your answers, I found the problem, I forgot to set the filename to the file path in the header. I changed it to this:

filePart.setHeader(QNetworkRequest::ContentDispositionHeader,
                           QVariant("form-data; name=\"image\"; filename=\""+fileInfo.filePath()+"\""));

Thanks for the Wireshark advice @raven-worx, it was really helpful