How do you redirect downloads for custom maps?

[Mcduke]

I've run a server for UT and was able to redirect downloads for custom mods and maps. I heard that you can do the same for COD, but how. Thanks, Mcduke

[akaender]

To my knowledge this isnt possible yet and probably wont be unless someone makes some sort of mod for it as iw could give a damn about what the server admins want/need. ;)