Unique HTTP Proxy Situation - suggestions?

[root@ve1023:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve1023:Active] config  b pool foo list
pool foo {
   members 200.200.200.101:80 {}
}
[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        if {[string tolower [HTTP::host]] equals "www.company.com"} {
                if {[string tolower [HTTP::uri]] starts_with "/thirdparty"} {
                        HTTP::header replace Host "thirdparty.company.com"
                }
        }
}
}

[root@ve1023:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.253(45435) <-> 172.28.19.79(80)
1323150377.0352 (0.0038)  C>S
---------------------------------------------------------------
GET /thirdparty/bhabhabha HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8r zlib/1.2.3 libidn/0.6.5
Host: www.company.com
Accept: */*

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

New TCP connection 2: 200.200.200.10(45435) <-> 200.200.200.101(80)
1323150377.0363 (0.0009)  C>S
---------------------------------------------------------------
GET /thirdparty/bhabhabha HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8r zlib/1.2.3 libidn/0.6.5
Host: thirdparty.company.com
Accept: */*

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