Topic: HTTP_REFERER and mongrel_cluster

Hi, I'm using configuration Apache 2.2 + Mongrel cluster
and I can not obtain information in my Rails app from @request.env["HTTP_REFERER"]

Does anybody know how to setup apache.conf to pass http referer to mongrel cluster.
This works for webrick but not in Apache+mongrel_cluster configuration.

This is my current apache conf.

  DocumentRoot /var/www/apps/

  # I use utf-8 for all my projects, so I force apache to send the good charset by default.
  # This is needed if you use page caching and want apache serves these with the good charset.
  AddDefaultCharset utf-8

  # Do not allow open proxying, allow only requests starting with a /
  <LocationMatch "^[^/]">
      Deny from all

  # Avoid open you server to proxying
  ProxyRequests Off           

  # Let apache pass the original host not the ProxyPass one
  ProxyPreserveHost On

  <Directory /var/www/apps/lovcicen_frontend/current/public>
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all

  # Configure mongrel_cluster
  <Proxy balancer://lovcicen_frontend_cluster>           

  RewriteEngine On