[users@httpd] Apache as a proxy but no HTTP_X_FORWARDED_FOR header

[Stephen(Tie) Hu]

Hi, 
    I am using apache http server as a SSL proxy. It's working quite well 
except it doesn't add HTTP_X_FORWARDED_FOR header. So I have no chance to know 
the real client IP. Does any one know how to force apache to add 
HTTP_X_FORWARDED_FOR header? 1000 thanks in ahead!
 
    Here is my apache server's version: 
Server version: Apache/2.2.6 (Unix)
Server built:   Sep 18 2007 11:26:13

    Here is my apache configuration section: 

ProxyRequests On
<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>

KeepAlive On
MaxKeepAliveRequests 100
AddDefaultCharset Off


Very Best Regards!
Stephen