I am trying to see if nginx (OSS, not commercial) can be used not only as a load balancer, but as a network router/switch in the event that I need to shut my app down and redirect traffic to a CDN/static page, etc.

I was hoping to find a REST API that might allow me to configure routing rules on the fly but alas, I see nothing.

Does nginx provide this functionality out of the box? Or can I pair it with something that does? This would be a Java app it is balancing, and I see there is an nginx-clojure (https://github.com/nginx-clojure/nginx-clojure) module. So perhaps I could expose a REST endpoint through Java (running on the nginx server) somehow...thoughts?