Newby needs irule help

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_RESPONSE {
   if {[HTTP::cookie exists last_login]} {
      foreach aheader [HTTP::header names] {
         log local0. "[IP::client_addr]:[TCP::client_port] | ${aheader}: [HTTP::header value $aheader]"
      }
   }
}
}

 on client

[root@centos251 ~] curl -I http://172.28.19.79
HTTP/1.1 200 OK
Date: Thu, 04 Oct 2012 17:16:06 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Fri, 11 Nov 2011 14:48:14 GMT
ETag: "4183e4-3e-9c564780"
Accept-Ranges: bytes
Content-Length: 62
Set-Cookie: last_login=tasmania path=/
Connection: close
Content-Type: text/html; charset=UTF-8

 on bigip

[root@ve10:Active] config  tail -f /var/log/ltm
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Date: Thu, 04 Oct 2012 17:16:06 GMT
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Server: Apache/2.2.3 (CentOS)
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Last-Modified: Fri, 11 Nov 2011 14:48:14 GMT
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | ETag: "4183e4-3e-9c564780"
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Accept-Ranges: bytes
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Content-Length: 62
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Set-Cookie: last_login=tasmania path=/
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Connection: close
Oct  5 00:59:48 local/tmm info tmm[4907]: Rule myrule : 172.28.19.251:49826 | Content-Type: text/html; charset=UTF-8