Trouble removing cookie

[root@iris:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.17.33:http
   ip protocol tcp
   profiles {
      http {}
      tcp {}
   }
}
[root@iris:Active] config  b pool foo list
pool foo {
   members 10.10.70.110:http {}
}

New TCP connection 1: 192.168.206.102(61397) <-> 172.28.17.33(80)
---------------------------------------------------------------
1319006186.8912 (0.0170)  C>S
---------------------------------------------------------------
GET /dog.gif HTTP/1.1
Host: 172.28.17.33
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://172.28.17.33/
Cookie: my-cookie=helloworld

New TCP connection 2: 10.10.72.30(61397) <-> 10.10.70.110(80)
---------------------------------------------------------------
1319006186.8913 (0.0172)  C>S
---------------------------------------------------------------
GET /dog.gif HTTP/1.1
Host: 172.28.17.33
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://172.28.17.33/
Cookie: my-cookie=helloworld


[root@iris:Active] config  b virtual bar rule myrule
[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 rule myrule list
rule myrule {
   when HTTP_REQUEST {
        HTTP::cookie remove "my-cookie"
}
}

New TCP connection 1: 192.168.206.102(61539) <-> 172.28.17.33(80)
---------------------------------------------------------------
1319006687.2403 (0.0396)  C>S
---------------------------------------------------------------
GET /dog.gif HTTP/1.1
Host: 172.28.17.33
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://172.28.17.33/
Cookie: my-cookie=helloworld

New TCP connection 2: 10.10.72.30(61539) <-> 10.10.70.110(80)
---------------------------------------------------------------
1319006687.2404 (0.0398)  C>S
---------------------------------------------------------------
GET /dog.gif HTTP/1.1
Host: 172.28.17.33
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://172.28.17.33/