Is it possible to insert an X-Country-Code into the F5 BIG-IP response to the client.

I want to do this only for a specific URI pattern. I tried the iRule below, using HTTP_REQUEST to capture the country code when the pattern /java is matched and substituting it in the HTTP_RESPONSE, but it didn't work. Any suggestions would be greatly appreciated.

HTTP_REQUEST {

if {[HTTP::uri] starts_with "/java"} {
set country_code [whereis [IP::client_addr] country]

log local0. "Matched /example - client IP: [IP::client_addr], country: $country_code"

# Temporarily store country code in a header for use in HTTP_RESPONSE
HTTP::header insert "X-Country-Temp" $country_code
} }

when HTTP_RESPONSE {

if {[HTTP::uri] starts_with "/java"} {
log local0. "HTTP_RESPONSE triggered for [IP::client_addr]"

HTTP::header insert "X-Country-Code" "$country_code"
log local0. "Added X-Country-Code: $country_code to response"
} }

Also I tried below in the response , but no luck

when HTTP_RESPONSE {

if {[HTTP::header exists "X-Country-Code" ]} {
log local0. "HTTP_RESPONSE triggered for [IP::client_addr]"

HTTP::header insert "X-Country-Code" "$country_code"
log local0. "Added X-Country-Code: $country_code to response"
} }