visitor/session cookie without persistence

when RULE_INIT {

   set static::session_cookie "my_session_cookie"
}
when HTTP_REQUEST {

    Check if cookie exists in request
   if {[HTTP::cookie $static::session_cookie] eq ""}{
      set insert_cookie 1
   } else {
      set insert_cookie 0
   }
}
when HTTP_RESPONSE {

    Insert a cookie in the response if one wasn't present in the request.
    Use the client IP:port plus unixtime.
    Could use something random instead like an 8 digit psuedo random number: [format "%08d" [expr { int(100000000 * rand()) }]]
   if {$insert_cookie}{
      HTTP::cookie insert name $static::session_cookie value "[IP::client_addr]_[TCP::client_port]_[clock seconds]"
   }
}