Websense content gateway and f5 iApp with SSl

Trying to configure the Iapp for websense and everything works as expected with http. The websense content gateway recognizes the user id of the user and websense applies filters based on the users AD account that it sees. With https the websense content gateway only sees the ip. Has anyone gotten this to work and how. I am not looking for the userid of a login of a https website to be passed. I am looking for the userid of the user who is browsing to a https site that is sent via the DC agent in websense. If someone has worked with this I would welcome some ideas.