HAProxy and SSL

HAProxy does not have support for SSL. Common solution is to use Stud to handle SSL and send un-encrypted data to the backends.
Terminating SSL in the load balancer is not considered a good idea because it does not scale.
It is considered better to use webservers like Nginx with session caching enabled.
Good benchmark comparing Nginx, Stud and Stunnel is here- http://vincent.bernat.im/en/blog/2011-ssl-benchmark.html.
Another benchmark comparing stud,stunnel and nginx: http://matt.io/entry/uq and the follow up which establishes Nginx to be just as performant as Stud - the key is picking the right cipher.
http://matt.io/technobabble/hivemind_devops_alert:_nginx_does_not_suck_at_ssl/ur