Hello, I'm very new at qt, but I need to upload an image to a Amazon S3 server, but I keep getting this error:

Qt Code: 
  1. Failure "Error downloading https://bucket_name.s3.amazonaws.com/ - server replied: Forbidden"
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I check all the credencialas and keys and they are working fine because I was able to upload the image with curl comands. The problem was when I tried to implemt the code on qt5.

So this it's the code I'm ussing:

Qt Code: 
  1. QEventLoop eventLoop;
  2.     QNetworkAccessManager mgr;
  3.     QObject::connect(&mgr, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));
  4.  
  5.     QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
  6.  
  7.     QHttpPart textPart;
  8.     textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"key\""));
  9.     textPart.setBody("c_test/Pantallazo-10.jpg");
  10.  
  11.     QHttpPart textPart1;
  12.     textPart1.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"AWSAccessKeyId\""));
  13.     textPart1.setBody("myAccessKeyId");
  14.  
  15.     QHttpPart textPart2;
  16.     textPart2.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"Policy\""));
  17.     textPart2.setBody("myPolicy");
  18.  
  19.     QHttpPart textPart3;
  20.     textPart3.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"Signature\""));
  21.     textPart3.setBody("mySignature");
  22.  
  23.     QHttpPart imagePart;
  24.     imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
  25.     imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"file\""));
  26.     QFile *file = new QFile(QDir::homePath() + "Pantallazo-10.jpg");
  27.     file->open(QIODevice::ReadOnly);
  28.     imagePart.setBodyDevice(file);
  29.     file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart
  30.  
  31.     multiPart->append(textPart);
  32.     multiPart->append(textPart1);
  33.     multiPart->append(textPart2);
  34.     multiPart->append(textPart3);
  35.     multiPart->append(imagePart);
  36.  
  37.     QUrl url = QUrl(QString("https://bucket_name.s3.amazonaws.com/"));
  38.  
  39.     QNetworkRequest request(url);
  40.        QNetworkReply *reply = mgr.post(request, multiPart);  // POST
  41.     eventLoop.exec(); // blocks stack until "finished()" has been called
  42.  
  43.     if (reply->error() == QNetworkReply::NoError) {
  44.         qDebug() << "Success";
  45.     } else {
  46.         //failure
  47.         qDebug() << "Failure" <<reply->errorString();
  48.         multiPart->setParent(reply);
  49.         delete reply;
  50.     }
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I really don't know what to do next, I'm pretty stuck on this one.