The precautions related to request distribution in the round-robin format for the redirector are as follows:

• Sending requests to the Web container when the J2EE application is not running
  When distributing requests with the round-robin format, requests are sent to the Web container even when the J2EE application is not running. Therefore, you must isolate all the Web containers from the system, and then implement the changes in J2EE applications.
  
• Disabling of health check by the load balancer
  When the load balancer and request distribution with the round-robin format are combined and used, requests are normally forwarded to the Web container by the redirector even if a failure occurs in the J2EE server. As a result, the failure on the J2EE server cannot be detected in the load balancer and the Web container cannot be monitored.