http as a transport for rsync?

[Robert Denton]

Given the increasing reliance on proxies and filtering devices, it is  
harder and harder to rsync across the net.  Do you think we will ever  
be able to use http as a transport for rsync?  For example, when will  
I be able to do this:

rsync -arv http://rsync.domain.tld/webroot

It would seem that this is the logical next step for rsync and is the  
one feature I most desparately need. What would be required for  
this?  An apache mod?  Perhaps this email can be a catalyst for a  
positive brainstorming session towards this end.

Robert