Is there a smarter way to communicate with control port when using HAProxy

[ash0080]

eg.

Client
|--------> HAProxy (127.0.0.1:16379)
|--------> TOR Instance (127.0.0.1:9000) (cp: 9900)
|--------> TOR Instance (127.0.0.1:9001) (cp: 9901)

When client found a tor circle not work, ( eg, 9000 )
how to send signal newnym to renew it?
cuz client doesn't know which one used

or at least during 15s ( default renew duration ),
the HAProxy will still keep forwarding traffic to this broken instance?

So, my question is,
Is there a possibility to "smart communicate" with control ports?
Besides, is there a command forward interface for docker container?

[bloigge]

Any news on this? I also would like to renew a broken connection. If it is not possible for the client, how could a script look like on the server which checks for broken connections repeatedly?