haproxy.conf
============

frontend spdy
  mode tcp
  bind xxx.xxx.xxx.xxx:443 ssl crt /etc/haproxy/ssl.pem crt /etc/haproxy/certs.d npn spdy/3.1,http/1.1 ciphers AES256+EECDH:AES256+EDH:AES128+EDH:EECDH:!aNULL:!eNULL:!LOW:!DES:!3DES:!RC4; no-sslv3
  option tcplog
  log global

  # route to nginx
  use_backend nginx_spdy if { ssl_fc_npn -i spdy/3.1 }
  default_backend nginx
  
backend nginx
  mode tcp
  server nginx01 xxx.xxx.xxx.xxx:80

backend nginx_spdy
  mode tcp
  server nginx02 xxx.xxx.xxx.xxx:81

nginx.conf
==========

server {
  listen xxx.xxx.xxx.xxx:80;
  listen xxx.xxx.xxx.xxx:81 spdy;
  server_name $host;
  server_name_in_redirect on;
  autoindex off;

  add_header Strict-Transport-Security "max-age=31536000";

  location / {
  ...