For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

ashokp1's avatar
ashokp1
Icon for Altostratus rankAltostratus
Oct 02, 2025
Solved

F5 iRule for X-Country-Code not working as expected

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 th...
http response
irule
X-Country-Code
  • ashokp1's avatar
    ashokp1
    Oct 22, 2025

    Thanks Jeffrey_Granier, I tried the code below which resolved my issue. Thanks for your support.

    when HTTP_REQUEST {
        if {[HTTP::uri] starts_with "/java"} {
            set country_code [whereis [IP::client_addr] country]
            log local0. "Matched /java - client IP: [IP::client_addr], country: $country_code"
            set session_key "country_[TCP::client_port]"
            table set $session_key $country_code 300
        }
    }

    when HTTP_RESPONSE_RELEASE {
        set session_key "country_[TCP::client_port]"
        set country_code [table lookup $session_key]
        if {$country_code ne ""} {
            log local0. "HTTP_RESPONSE triggered for session $session_key, country: $country_code"
            HTTP::header insert "X-Client-Country-Code" $country_code
            log local0. "Added X-Country-Code: $country_code to response"

            # Clean up the session table
            table delete $session_key
        }
    }

     
Injeyan_Kostas's avatar
Injeyan_Kostas
Icon for Nacreous rankNacreous
Oct 02, 2025

Hello ashokp1​ 

You are injecting an HTTP Header in Request which will not exist in Response
You should keep the value in a variable and inject it directly in Response

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

 

when HTTP_RESPONSE 
{
	if {[info exists country_code]} 
	{
		HTTP::header insert "X-Country-Code" "$country_code"
	}
}