apache and mod_proxy: How can i log which worker was selected?

Question

we are runing an apache reverse proxy in front of several tomcats. sometimes we like to know to which server the request was forwarded. as we use mod_proxy_balancer.

i tried

 \"%{X-Forwarded-Server}i\"

but this doesn't work. it shows the name of my loadbalancer (apache)

How can i log which worker was selected?

Answer 1

Try %{BALANCER_WORKER_ROUTE}e.

There's a few other variables available for checking on the request routing, too; see here.