irule 404 page

[root@ve11a:Active:Changes Pending] config  tmsh
root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.20.14:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        myrule
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vlans-disabled
}
root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}
root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm rule myrule
ltm rule myrule {
    when HTTP_RESPONSE {
  if { [HTTP::status] == 404 } {
    HTTP::respond 200 content [ifile get maint_html_ifile] noserver "Content-Type" "text/html"
  }
}
when HTTP_REQUEST {
  switch [HTTP::uri] {
    "/f5.gif" { HTTP::respond 200 content [ifile get f5_gif_ifile] noserver "Content-Type" "image/gif" }
  }
}
}

 original response from pool

[root@ve11a:Active:Changes Pending] config  curl -I http://200.200.200.101/something
HTTP/1.1 404 Not Found
Date: Sat, 19 Jan 2013 06:50:00 GMT
Server: Apache/2.2.3 (CentOS)
Content-Type: text/html; charset=iso-8859-1

 rewritten response from bigip

[root@ve11a:Active:Changes Pending] config  curl -i http://172.28.20.14/something
HTTP/1.0 200 OK
Content-Type: text/html
Connection: Keep-Alive
Content-Length: 97




This is maintenance page.




[root@ve11a:Active:Changes Pending] config  curl -I http://172.28.20.14/f5.gif
HTTP/1.0 200 OK
Content-Type: image/gif
Connection: Keep-Alive
Content-Length: 3994