Русские буквы в rowheader файла

void AppCore::up_file(QString m_doc_id, QString m_title)
{
    QString m_fileName;

    url_upload =server_ip_loc+"in_put/up_file";
    QString p_path;
    QByteArray datas;
    p_path=QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation);
    m_fileName=p_path+"/temp_esd/"+"photo.jpg";
    QFile file(m_fileName);
    file.open(QIODevice::ReadOnly);
    datas = file.readAll();
    networkManager = new QNetworkAccessManager();
    QNetworkRequest request( url_upload );

    m_title="фотография";
    request.setRawHeader( "Content-Type", "image/jpeg" );
    request.setRawHeader( "v_user_id", user_id.toUtf8() );
    request.setRawHeader( "title", m_title.toUtf8() );
    request.setRawHeader( "v_doc_id", m_doc_id.toUtf8() );
    networkManager = new QNetworkAccessManager();
    QNetworkReply* replay_up =  networkManager->post(request, datas);

    connect(networkManager, &QNetworkAccessManager::finished, this, &AppCore::onResponse_up_file);
}