I am trying to upload a file on the server. I have written this code, but i am receiving error in reply from server (on call of uploadfinished() [in code])

Qt Code: 
  1. uploadmanager::uploadmanager()
  2. {
  3.     connect(&manager, SIGNAL(finished(QNetworkReply*)),
  4.             SLOT(uploadFinished(QNetworkReply*)));
  5. }
  6.  
  7.  
  8. void uploadmanager::doUpload()
  9. {
  11.     QString message_d = QString("Unable to open file");
  12.     args<<"E:\\SMS\\spam_freq.csv";
  13.     foreach (QString arg, args) {
  14.        QFile file(arg);
  15.        if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
  16.        {
  17.            QMessageBox::information(this, "Error", message_d);
  18.            return;
  19.        }
  20.  
  21.     QNetworkRequest request;
  22.     request.setUrl(QUrl("me.xyz.com/smsspam"));
  23.     request.setRawHeader("Content-type", "application/x-www-form-urlencoded");
  24.     request.setRawHeader("Accept","text/plain");
  25.     file.open(QIODevice::ReadOnly | QIODevice::Text);
  26.     QByteArray fileBinaryData(file.readAll());
  27.     file.close();
  28.     request.setRawHeader("data",fileBinaryData);
  29.     QNetworkReply *reply = manager.post(request, fileBinaryData);
  30.     currentUploads.append(reply);
  31. }
  32.  
  33. }
  34.  
  35. void uploadmanager::uploadFinished(QNetworkReply *reply)
  36. {
  37.  
  38.     if (reply->error())
  39.     {
  40.         QString message_er = QString("Error in Upload");
  41.         QMessageBox::information(this, "Err", message_er); //I am getting this msg
  42.     }
  43.     else
  44.     {
  45.         QString message_d = QString("Upload Complete");
  46.         QMessageBox::information(this, "Upload Complete", message_d);
  47.  
  48.     }
  49.  
  50.     currentUploads.removeAll(reply);
  51.     reply->deleteLater();
  52.  
  53.     if (currentUploads.isEmpty())
  54.         return;
  55.  
  56. }
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The PHP script at the server is below:

Qt Code: 
  1. <?php
  2.     // Read the raw http data from the post
  3.     $data = $_POST['data'];
  4.     // Ungzip the wav file
  5.    // $chunk = gzuncompress($data);
  6.     if (!$data) {
  7.       echo -1;
  8.       die();
  9.     }
  10.     $uid  = uniqid();
  11.     $filename = "$uid.csv";
  12.     $filepathname = "uploads/$filename";
  13.     $handle = fopen($filepathname, 'wb');
  14.     fputs($handle, $data, strlen($data));
  15.     fclose($handle);
  16.     ?>
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Kindly, help me in constructing packet header and request in correct format as per the script. I think, i am not doing that in right way.

Any help would be appreciated.