Detect HTTP Pipelining Request

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.252:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when CLIENT_ACCEPTED {
  log local0. "CLIENT_ACCEPTED - client [IP::client_addr]:[TCP::client_port]"
  TCP::collect
}
when CLIENT_DATA {
  log local0. "CLIENT_DATA - client [IP::client_addr]:[TCP::client_port] payload [TCP::payload]"
  if { [llength [lsearch -all [TCP::payload] HEAD]] > 1 } {
    log local0. "CLIENT_DATA - client [IP::client_addr]:[TCP::client_port] reject"
    reject
    return
  }
  TCP::release
  TCP::collect
}
when HTTP_REQUEST {
  log local0. "HTTP_REQUEST - client [IP::client_addr]:[TCP::client_port] request [HTTP::request]"
}
}

[root@ve10:Active] config  tail -f /var/log/ltm
Jul 28 09:09:38 local/tmm info tmm[22008]: Rule myrule : CLIENT_ACCEPTED - client 172.28.20.17:47963
Jul 28 09:09:38 local/tmm info tmm[22008]: Rule myrule : CLIENT_DATA - client 172.28.20.17:47963 payload HEAD /frist HTTP/1.1  Host:     HEAD /second HTTP/1.1  Host:
Jul 28 09:09:38 local/tmm info tmm[22008]: Rule myrule : CLIENT_DATA - client 172.28.20.17:47963 reject

Jul 28 09:10:05 local/tmm info tmm[22008]: Rule myrule : CLIENT_ACCEPTED - client 172.28.20.17:47964
Jul 28 09:10:05 local/tmm info tmm[22008]: Rule myrule : CLIENT_DATA - client 172.28.20.17:47964 payload HEAD /normal 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: 172.28.19.252  Accept: */*
Jul 28 09:10:05 local/tmm info tmm[22008]: Rule myrule : HTTP_REQUEST - client 172.28.20.17:47964 request HEAD /normal 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: 172.28.19.252  Accept: */*