Multi-Conditional iRule using Basic Auth and 9.4.3

[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 class users list
class users {
   "foo" { "acbd18db4cc2f85cedef654fccc4a4d8" }
}
[root@ve1023:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   if { [HTTP::uri] contains "/uri/" } {
      if { [HTTP::header "Content-Type"] contains "text/xml" } {
         if { ! ( [IP::addr [IP::client_addr] equals 1.1.1.0/24] ) } {
            binary scan [md5 [HTTP::password]] H* password
            if { [class lookup [HTTP::username] users] equals $password } {
               log local0. "User [HTTP::username] authorized to access /uri/"
            } else {
               if { [string length [HTTP::password]] != 0 } {
                  log local0. "User [HTTP::username] not authorized to access /uri/"
               }
               HTTP::respond 401
               log local0. "[IP::client_addr]:[TCP::client_port]: Sending 401 Response"
            }
         }
      }
   }
}
}

1
[root@ve1023:Active] config  curl -i http://172.28.19.79/uri/ -H "Content-Type: text/xml" -d "test=abc"
HTTP/1.0 401 Unauthorized
WWW-Authenticate: Basic realm=""
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@ve1023:Active] config  tail -f /var/log/ltm
Apr  5 21:23:16 local/tmm info tmm[4797]: Rule myrule : 172.28.19.80:43504: Sending 401 Response

2
[root@ve1023:Active] config  curl -i -u foo:foo http://172.28.19.79/uri/ -H "Content-Type: text/xml" -d "test=abc"
HTTP/1.1 404 Not Found
Date: Fri, 06 Apr 2012 04:24:54 GMT
Server: Apache/2.2.3 (CentOS)
Content-Length: 279
Content-Type: text/html; charset=iso-8859-1

...snipped...

[root@ve1023:Active] config  tail -f /var/log/ltm
Apr  5 21:24:25 local/tmm info tmm[4797]: Rule myrule : User foo authorized to access /uri/

3
[root@ve1023:Active] config  curl -i -u foo:wrong http://172.28.19.79/uri/ -H "Content-Type: text/xml" -d "test=abc"
HTTP/1.0 401 Unauthorized
WWW-Authenticate: Basic realm=""
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@ve1023:Active] config  tail -f /var/log/ltm
Apr  5 21:24:59 local/tmm info tmm[4797]: Rule myrule : User foo not authorized to access /uri/
Apr  5 21:24:59 local/tmm info tmm[4797]: Rule myrule : 172.28.19.80:43591: Sending 401 Response