IIS farm of 10 and a load balancer- The best way to track which web server has handled an http request

Hi, We have a farm consists of 10 IIS servers and a hardware load balancer appliance. When an error (like http 500) happens, we don’t know which exact IIS server it relates to. We have to search the event log of all 10 servers to find the error. Is there any feature in IIS that automatically adds server number to the HTTP responses so we can track the web server that generates the http response after hardware load balancer? Thank you