QNetworkAccessManager post

Hello
I want to ask, is there a method to get number of bytes sent to server by QNetworkAccessManager::post() like SIGNAL downloadProgress(qint64,qint64) in QNetworkReply for receiving data?
I want to upload the file by http form on some site, and I want to calculate the speed of uploading that file, but I can't find the solution.
Thanks in advance

Something wrong with QNetworkReply::uploadProgress()?

I do not know how I couldn't notice that there is signal for that.
Thanks