Irule to redirect based on host and uri - lowercase issue

[root@ve1023:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.65.152:http
   ip protocol tcp
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   set http_uri [string tolower [HTTP::uri]]
   if {[string tolower [HTTP::host]] equals "ecm.express.tnt"} {
      if {$http_uri ends_with "&lang=anon&country=anon"} {
         set dnum [URI::query $http_uri "objid"]
         set action [URI::query $http_uri "objaction"]
         if {$action equals "open" and $dnum ne ""} {
            HTTP::redirect "http://ecm.express.tnt/otcs/livelink.exe?func=LL.login&username=Anonymous&password=&NextURL=%2Fotcs%2Flivelink%2Eexe%3Ffunc%3Ddoc%2Efetch%26nodeid%3D$dnum"
         } else {
             do something else
         }
      }
   }
}
}

[root@ve1023:Active] config  curl -I "http://ecm.express.tnt/livelink/livelink.exe?func=ll&objid=149998544&objAction=open&lang=Anon&country=Anon"
HTTP/1.0 302 Found
Location: http://ecm.express.tnt/otcs/livelink.exe?func=LL.login&username=Anonymous&password=&NextURL=%2Fotcs%2Flivelink%2Eexe%3Ffunc%3Ddoc%2Efetch%26nodeid%3D149998544
Server: BigIP
Connection: Keep-Alive
Content-Length: 0