X-Forwarded-For: Multiple IP's Chained | Need Original IP | iRules and HTTP Profile?

try this code

when HTTP_REQUEST {
    set FIRST_XFF [[getfield [lindex [HTTP::header values X-Forwarded-For] 0] "," 1]]
    HTTP::header insert X-Forwarded-For [IP::remote_addr]
    HTTP::header remove X-Forwarded-For
    HTTP::header remove X-Forwarded-For-Raw
    HTTP::header remove CF-Connecting-IP
    HTTP::header insert X-Forwarded-For FIRST_XFF
    HTTP::header insert X-Forwarded-For-Raw $FIRST_XFF
    HTTP::header insert CF-Connecting-IP $FIRST_XFF
}