proxy with http install method?

[Douglas McClendon <dmc fedora filteredperception org>]

This has probably been asked before, but googling for "kickstart http 
proxy" didn't give me much help (except for ubuntu).

Can an http proxy be used for and specified by a kickstart install? 
(fedora 8?)

If it isn't a known possibility, has the migration to the yum backend 
enabled some way to get this to work, perhaps with some mucking in %pre?

-dmc