URI Query question

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   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 HTTP_REQUEST {
  if {[URI::query "?&[HTTP::query]" bar] ne ""} {
    pool foo_bar_pool
  } elseif {[URI::query "?&[HTTP::query]" foo] ne ""} {
    HTTP::uri "[HTTP::uri]&bar=1234"
    pool foo_bar_pool
  } elseif {[URI::query "?&[HTTP::query]" USER-ID] ne ""} {
    pool user_pool
  } else {
     do something
  }
}
}
[root@ve10:Active] config  b pool foo_bar_pool list
pool foo_bar_pool {
   members 200.200.200.101:80 {}
}
[root@ve10:Active] config  b pool user_pool list
pool user_pool {
   members 200.200.200.111:80 {}
}

 foo

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(50138) <-> 172.28.19.252(80)
1360889294.2045 (0.0009)  C>S
---------------------------------------------------------------
HEAD /something?foo=abcdef 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: */*

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(50138) <-> 200.200.200.101(80)
1360889294.2056 (0.0009)  C>S
---------------------------------------------------------------
HEAD /something?foo=abcdef&bar=1234 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: */*

---------------------------------------------------------------

 bar

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(50139) <-> 172.28.19.252(80)
1360889333.7185 (0.0010)  C>S
---------------------------------------------------------------
HEAD /something?bar=xyz&foo=abcdef 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: */*

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(50139) <-> 200.200.200.101(80)
1360889333.7196 (0.0009)  C>S
---------------------------------------------------------------
HEAD /something?bar=xyz&foo=abcdef 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: */*

---------------------------------------------------------------

 USER-ID

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(50140) <-> 172.28.19.252(80)
1360889374.9256 (0.0011)  C>S
---------------------------------------------------------------
HEAD /something?USER-ID=1111 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: */*

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(50140) <-> 200.200.200.111(80)
1360889374.9274 (0.0017)  C>S
---------------------------------------------------------------
HEAD /something?USER-ID=1111 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: */*

---------------------------------------------------------------