performance – How to produce a very fast https empty reply from nginx? – Stack Overflow

I have an nginx balancer and after two application servers with apache and tomcat.

I need to create a very fast https response server to let the client monitor the speed of its connection measuring the latency of a Get http Ajax call.
So my goal is to create the fastest ever http reply from nginx balancer. Don’t mind the content of the response, it can be empty. It is just to let the client understand how long does it take a ping/pong call.

What do you think is the best way? Of course I already excluded a simple script and an empty file for its overhead.