connection limit on virtual server

when RULE_INIT {
   set ::active_connections 0
   set ::max_connections 1000
   set ::html_content "over limit"
   set ::debug 1
}
when CLIENT_ACCEPTED {
    Initialize a variable to track whether we're over the limit 
      and should send a response from the rule for this request
   set over_limit 0
    Check if we're over the maximum allowed connections
   if {$::active_connections > $::max_connections } {
      set over_limit 1
   } else {
       We're not over the max, so don't respond to the request
      incr ::active_connections 1
   }
}
when HTTP_REQUEST {
    If we're over the limit for this connection, send a response
   if {$over_limit}{
       Send a response
      HTTP::respond 200 content $::html_content
       Close the connection
      HTTP::close
       Log a message to /var/log/ltm if debug is enabled
      if {$::debug}{log local0. "Over limit (current/max: $::active_connections/$::max_connections). Sent response to [IP::client_addr]"}
   }
}
when CLIENT_CLOSED {
    A connection was closed, so decrement the global counter
   incr ::active_connections -1
}