irule to insert cookie

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   destination 172.28.19.252:80
   ip protocol 6
   rules myrule
   persist cookie
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
  if { [HTTP::cookie exists cpool] } {
    switch [HTTP::cookie cpool] {
      0 { set cpool 0; pool foo0 }
      1 { set cpool 1; pool foo1 }
      default {
         do soemthing
        reject
      }
    }
  } else {
    if { [URI::query "?&[HTTP::query]" "spentityids"] == "value0" } {
      set cpool 0
      pool foo0
    } else {
      set cpool 1
      pool foo1
    }
  }
}
when HTTP_RESPONSE {
  HTTP::cookie insert name cpool value $cpool
}
}
[root@ve10:Active] config  b pool foo0 list
pool foo0 {
   members 200.200.200.101:80 {}
}
[root@ve10:Active] config  b pool foo1 list
pool foo1 {
   members 200.200.200.111:80 {}
}

[root@ve10:Active] config  curl -i "http://172.28.19.252/?spentityids=value0&something=bhabhabha"
HTTP/1.1 200 OK
Date: Sat, 26 Jan 2013 05:20:00 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Sat, 27 Oct 2012 03:22:35 GMT
ETag: "4183f3-59-f28f94c0"
Accept-Ranges: bytes
Content-Length: 89
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo0=1707657416.20480.0000; path=/
Set-Cookie: cpool=0;




This is 101 host.




[root@ve10:Active] config  curl -i "http://172.28.19.252/?spentityids=somethingelse&something=bhabhabha"
HTTP/1.1 200 OK
Date: Sat, 26 Jan 2013 04:55:47 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Wed, 30 Nov 2011 05:42:33 GMT
ETag: "418416-30-33ce6440"
Accept-Ranges: bytes
Content-Length: 48
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo1=1875429576.20480.0000; path=/
Set-Cookie: cpool=1;



This is 111 host.



[root@ve10:Active] config  curl -i http://172.28.19.252/ -H "Cookie: cpool=0"
HTTP/1.1 200 OK
Date: Sat, 26 Jan 2013 05:21:44 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Sat, 27 Oct 2012 03:22:35 GMT
ETag: "4183f3-59-f28f94c0"
Accept-Ranges: bytes
Content-Length: 89
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo0=1707657416.20480.0000; path=/
Set-Cookie: cpool=0;




This is 101 host.




[root@ve10:Active] config  curl -i http://172.28.19.252/ -H "Cookie: cpool=1"
HTTP/1.1 200 OK
Date: Sat, 26 Jan 2013 04:56:49 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Wed, 30 Nov 2011 05:42:33 GMT
ETag: "418416-30-33ce6440"
Accept-Ranges: bytes
Content-Length: 48
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo1=1875429576.20480.0000; path=/
Set-Cookie: cpool=1;



This is 111 host.