X-forward-for not logging in apache listening on port 443

An iRule to insert an XFF and for crosscheck would look like this:

when HTTP_REQUEST {
    HTTP::header insert X-Forwarded-For [IP::client_addr]
}

when HTTP_REQUEST_SEND {
    if {[clientside {HTTP::header exists "X-Forwarded-For"}]} {
        foreach xffvalue [clientside {HTTP::header values "X-Forwarded-For"}] {
            log local0. "serverside XFF: $xffvalue"
        }
    }
}

Run 'tail -f /var/log/ltm' to verify the header insert in the LTM log facility.