HTTP::cookie insert not working

version 10.2

This is a very light weight version of my rule. Basically what I need is to set cookie using a source address list.

The matchclass works perfect, but I am not getting any cookies sent to the client.

IE http watch and FF developer tools both show no cookie being sent by the F5.

when HTTP_REQUEST { 
log local0.info "IP address is [IP::client_addr]" 
} 
when HTTP_RESPONSE { 
set tmp_IP [IP::client_addr] 
log local0.info "$tmp_IP" 
if {[matchclass $tmp_IP equals webapp_pilot] }{ 
HTTP::cookie insert name pcookie value y 
log local0.info "match" 
} else { 
HTTP::cookie insert name pcookie value n 
log local0.info "no match" } }