Need to chaining with Bluecoat Proxy SG

Hello,

I need to make the Bluecoat ProxySG as a cashing and the Websence as a web filter, after i following the below documentation the traffic is forward but without the client user display and IP.

http://www.websense.com/content/support/library/deployctr/v76/dic_wcg_deploy_chaining.aspx

Anyone know how to attache the username and IP with the traffic?

Thanks