Irule not working

since 11.4, the best way to do what you want is to create a LTM policy. it is easier to configure in GUI and best to see rules.

The following lines allow to create policy in TMSH and create expected rules:

create ltm policy /Common/eulyncweb01-HTTP requires add { http } strategy first-match controls add { forwarding }
modify ltm policy /Common/eulyncweb01-HTTP rules add {UCPhone {  actions add {  0 { forward select node 10.96.96.16 } }   conditions add {  1 { http-host host values { eulyncweb01.csmglobal.net } } 2 { http-uri path contains values { "/RequestHandler/Files/UCPhone" } } }  ordinal 1 }}
modify ltm policy /Common/eulyncweb01-HTTP rules add {redirect {  actions add { 0 { http-reply redirect location https://[HTTP:host][HTTP::uri] } }  ordinal 2 }}

and the configuration is: (you can load it with tmsh load sys merge from-terminal

ltm policy eulyncweb01-HTTP {
    controls { forwarding }
    requires { http }
    rules {
        UCPhone {
            actions {
                0 {
                    forward
                    select
                    node 10.96.96.16
                }
            }
            conditions {
                1 {
                    http-host
                    host
                    values { eulyncweb01.csmglobal.net }
                }
                2 {
                    http-uri
                    path
                    contains
                    values { /RequestHandler/Files/UCPhone }
                }
            }
            ordinal 1
        }
        redirect {
            actions {
                0 {
                    http-reply
                    redirect
                    location https://[HTTP:host][HTTP::uri]
                }
            }
            ordinal 2
        }
    }
    strategy first-match
}