Redirecting https traffic to an https subdomain?

class name_dr {
  "drtest dr"
}

when HTTP_REQUEST {
set cust [getfield [HTTP::uri] "/" 2]
set drRedir [findclass $cust $::name_dr " "]
if {$drRedir != ""}{
HTTP::redirect "https://dr.domain.com/[HTTP::uri]"
    }
}