iRule to set SameSite for compatible clients and remove it for incompatible clients (LTM|ASM|APM)

Hello  ,

Nice Irule and work but I get an issue with it, I have a F5 with version BIG-IP 13.1.3.2 Build 0.0.4 Point Release 2.

I get the error below:

• 01070151:3: Rule [/Common/SameSite] error: /Common/SameSite:192: error: [undefined procedure: HTTP::has_responded][HTTP::has_responded]

So regarding the documentation, the 'HTTP::has_responded' variable appears after version BIGIP-14.0.

Then I've checked the GitHub repo dedicated to prior version 12 (https://github.com/f5devcentral/irules-toolbox/blob/master/security/http/cookies/samesite-attributes-pre-v12.tcl) and I can see the the condition below is not taken into consideration:

when HTTP_RESPONSE_RELEASE priority 900 {
 
	# Don't do anything if a response has already been triggered for this request
	if {[HTTP::has_responded]}{
		if { $samesite_debug }{ log local0. "$prefix Exiting as response has already been triggered by another configuration option" }
		# exit this event in this iRule
		return
	}

So I have decided to test the Irule (https://github.com/f5devcentral/irules-toolbox/blob/master/security/http/cookies/samesite-attributes.tcl) removing the part below:

# Don't do anything if a response has already been triggered for this request
if {[HTTP::has_responded]}{
	if { $samesite_debug }{ log local0. "$prefix Exiting as response has already been triggered by another configuration option" }
	# exit this event in this iRule
	return
}

It seems to work correctly, but could you confirm if doing that we can get side effects or not, what could be the exact impact ?

Do you have any advice to replace it otherwise by another method ?

Many thanks in advance.

Have a nice day,

Alex