iRule

I have the below http iRule. Moving url to https and need to convert iRule for https use.

when HTTP_REQUEST {
if {[HTTP::header X-Forwarded-For] != ""} then {
persist uie [lindex [ split [lindex [HTTP::header values X-Forwarded-For] 0] "," ] 0]
} else {
persist uie [IP::client_addr]
}
}