Let cluster is a two nodes. If application on one node return http code different from 200, the balancer will still send requests to that node. Is this possible to configure balancing based on http-return codes?
Usually load balancers will not send requests to a node that responds with HTTP error code (http 200 is not the only OK-code...).
See also this response: http://serverfault.com/questions/59953/can-a-hw-loadbalancer-check-on-http-status-codes