[SOLVED]Can download via web browser but got forbidden error if trying with my Qt code.

[SetBetterPass]

I am trying to make downloader and one of things that it should download are videos from youtube. I found out how to get exact download link to download YT video, it looks like this :
http://r3---sn-bunjx-cune.c.youtube.com/videoplayback?sparams=algorithm,burst,cp,factor,id,ip,ipbits,itag,source,upn,expire&source=youtube&mv=m&ipbits=8&signature=9C15646EB192EAEA3ED858C59FE1855948CC22BD.03E702E0C29389D07014F9236CE3A94ADE266984&factor=1.25&key=yt1&ip=49.150.252.23&expire=1362343471&algorithm=throttle-factor&upn=N7N9OcfAVXs&burst=40&newshard=yes&fexp=900225,906335,911410,904448,914036,916611,901461,920704,912806,902000,922403,922405,929901,913605,925006,906938,931202,908529,920201,930101,906834,926403,913570,901451&sver=3&cp=U0hVR1NPUV9MS0NONV9LSVVFOkJxVHQxanR3dFhY&mt=1362320414&itag=34&id=e1b0652454a2c279&ms=au

I tried it in web browser and it asked me if want play in vlc or save, ok I saved it, got video downloaded, everything seems good. But in my code I send get request and reply from server is: Error downloading (url) - server replied: Forbidden. I am not sure if problem is in my code only if I have to make custom request but I have no idea what to put there...

my code:
@
void MainWindow::downloadRequested(){
for(int b=0;b<urls4Download.count();b++){
if(!folder.endsWith("/"))folder.append("/");
QString st = FileList.at(fileIndex[b]);
st.replace(QRegExp("/"),QString("_"));
file=new QFile(folder+st);
file->open(QIODevice::WriteOnly);
reply=nam.get(QNetworkRequest(QUrl(urls4Download.at(b)))); //actually only one url in list, the one from above
QEventLoop loop;
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
connect(reply,SIGNAL(finished()),this,SLOT(saveFile()));
connect(reply,SIGNAL(readyRead()),this,SLOT(readyReadFile()));
loop.exec();
}
}
void MainWindow::saveFile(){
if(reply->error())QMessageBox::warning(0,"warning",reply->errorString());
file->write(reply->readAll());
file->flush();
file->close();
reply->deleteLater();
}
void MainWindow::readyReadFile(){
downloadedBytes+=reply->size();
float prog=(downloadedBytes/float(bytesToDownload))*100;
file->write(reply->readAll());
int progress=int(prog);
ui->progressBar->setValue(progress);();

}
@

Thanks anyone who can help me.

[Code_ReaQtor]

Were you able to get/output any errors?

Anyways, some websites doesn't respond unless you set a "User Agent". I once encountered google ignoring simple search. But I was able to solve it by adding something like this:

@QNetworkRequest request;
request.setRawHeader("User-Agent", "MyBrowser");
request.setUrl(/url here/);
reply=nam.get(request);@

[mmallad]

Ya you must set user agent to avoid problems :)

[SetBetterPass]

I found out my problem was with , chars parts in link, they were translated into "," as I posted it here and in browser too, after longer time I found there was my problem. But thanks anyway this user-agent header may help me later :)