[CentOS-mirror] Abusive repodata downloads

Hi,

I'm one of the admins of ftp.halifax.rwth-aachen.de, which offers fedora and fedora-epel among other distributions and projects. I've recently noticed that many Fedora users (including EPEL, CentOS, and BlackArch) frequently re-download "repodata" files that haven't been updated since the previous request.

As some of those files are rather large ("filelists") and others are hit extremely often, I added fail2ban rules to deny users access to our service for some time.

Please adjust your software so that file mirrors like ours are not (ab)used like this. Files that haven't been changed usually shouldn't be downloaded.

Thanks Carsten