I recently wrote an article on using haproxy, SSL and SPDY with nginx backend servers.
This article is a little extra on top of that to explain how to enable statistics for haproxy so you can monitor the backend statuses etc.
Example stats page
listen stats :8000 mode http stats enable stats hide-version stats realm haproxy\ stats stats uri / stats auth admin:admin
Place the above content in the haproxy configuration file (/etc/haproxy/haproxy.cfg).
Be sure to replace admin:admin with your a proper username and password, username first, password after the colon.
Restart haproxy, and then browse to http://yousite.com:8000.