APM Branch rule based on Referring URL

If sessiondump does not give you the referrer in any of the existing APM variables then use the following iRule.

when ACCESS_SESSION_START {
  ACCESS::session data set "session.custom.client.referer" [HTTP::header "Referer"]
}

You can then use the Empty object from the General tab in the VPE and use this var to create your own branch logic.