I'd like to do something similar to SSL redirection, but slightly different.

I have a load balancer configured to listen on port 80 (HTTP) and 443 (HTTPS).

The load balancer does not have the ability to do any SSL redirection because if it did my life would be too easy (it's Amazon's Elastic Load Balancer, btw).

I have Tomcat (tcServer) listening on two ports: 80 and 81 (both HTTP).

Port 80 on the LB will take you to port 80 on tomcat.
Port 443 on the LB will take you to port 81 on tomcat (same web app).

What I would like is to have port 80 on tomcat send you back to 443 on the load balancer.

And all without touching the deployed webapp.

Any ideas?