Max Conn Per IP with 4xx response instead of connection drop

[Falco]

I want to create a HTTP file Server based on mod_qos.

For some download manager I need to anwser a request over connection limit with 4xx status. If I do just use QS_SrvMaxConnPerIP I got not answer at all. I did create a little workarround with QS_ClientEventRequestLimit 0 and an conditional EventRequest creation. Is there a better way to create a connection limit with http response? I'm not sure about the performance of my solution.

Let me give you an basic example which I did use for my local configuration test.
Testdetails: max 2 User and 1 Connection per IP

  QS_ClientEventRequestLimit 0
  QS_ErrorPage /error.html
  QS_ErrorResponseCode 429

  # max connections per client + 1
  QS_SrvMaxConnPerIP 2
  #reject max connections per IP + 1
  SetEnvIf QS_IPConn [2-9] QS_EventRequest
  #reject max clients + 1
  SetEnvIf QS_SrvConn [3-9] QS_EventRequest

  # maximum number of active TCP connections maxclients + 2 slots for error responses
  QS_SrvMaxConn 4 

Did I miss a feature or have it to be like this?

Kind Regards
Falco

[Pascal Buchbinder]

I think you should try to use the QS_ClientEventRequestLimit directive to limit the concurrent requests coming from the same IP