proxy and webdav

Hello,

I am currently studying subversion.
We have multiple sites and low network bandwidth, so we would like to 
set up a proxy, with a cache.
You mention in your website that there is some problems with some proxies.

So i have set up a proxy with apache 1.3, and a config file for a cache. 
It caches request properly, but subversion requests are not cached.

My questions are:

Is proxy caching taken into account in webdav and deltaV specifications ?
Is there a better proxy that implement correct webdav and deltaV caching ?
If it could work, do you have a configuration example for apache ?

Thanks for your help

  Ronan Meneu