X-Forwarded-for Header Insertion

[root@iris:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.17.33:http
   ip protocol tcp
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@iris:Active] config  b pool foo list
pool foo {
   members 10.10.70.110:http {}
}
[root@iris:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        if {not [HTTP::header exists "X-Forwarded-For"]} {
                HTTP::header insert X-Forwarded-For [IP::client_addr]
        }
}
}

[root@iris:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.17.20(54179) <-> 172.28.17.33(80)
1320232511.5958 (0.0011)  C>S
---------------------------------------------------------------
HEAD / HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.17.33
Accept: */*
---------------------------------------------------------------

New TCP connection 2: 10.10.72.30(54179) <-> 10.10.70.110(80)
1320232511.5962 (0.0003)  C>S
---------------------------------------------------------------
HEAD / HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.17.33
Accept: */*
X-Forwarded-For: 172.28.17.20