There might be a dirty way: In your backend, give a try to the above:
acl server1 srv_id 1 acl server2 srv_id 2 rspadd X-Server:\ server1 if server1 rspadd X-Server:\ server2 if server2 server 1 server1 1.1.1.1:80 id 1 server 2 server1 2.2.2.2:80 id 2 Please tell me if it works :) cheers
