Help with adding mobile redirect to existing irule

[root@ve10: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@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   if {[HTTP::host] equals "site.com"} {
      if {[class match -- [string tolower [HTTP::header value "User-Agent"]] equals mobile_class]} {
         HTTP::respond 301 Location "http://m.site.com[HTTP::uri]"
      } else {
         HTTP::respond 301 Location "http://www.site.com[HTTP::uri]"
      }
   } else {
      switch -glob [string tolower [HTTP::uri]] {
         "/" -
         "/*" -
         "/\\?*" -
         "/foo/*" -
         "/news/*" -
         "/sites/*" -
         "/node/*" { pool op_pool }
         default { pool def_pool }
      }
   }
}
}

[root@ve10:Active] config  curl -I http://172.28.19.79/something -H "Host: site.com"
HTTP/1.0 301 Moved Permanently
Location: http://www.site.com/something
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@ve10:Active] config  curl -I http://172.28.19.79/something -H "Host: site.com" -H "User-Agent: iphone"
HTTP/1.0 301 Moved Permanently
Location: http://m.site.com/something
Server: BigIP
Connection: Keep-Alive
Content-Length: 0