a simple HAProxy configure for the websocket

haproxy.conf

global  
    log 127.0.0.1 local0 info  
    maxconn 5000  
    ulimit-n 10000  
  
defaults  
    log global  
    mode http  
  
frontend pub-srv 0.0.0.0:8080  
    maxconn 5000 
    timeout client 40s  
    use_backend websocket if { hdr(Upgrade) -i WebSocket }  
    default_backend http  
  
backend websocket  
    timeout connect 100s  
    timeout server 600s  
    server ws1 localhost:8084 weight 1 maxconn 2500 check  
    server ws2 localhost:8085 weight 1 maxconn 2500 check  
  
backend http  
    timeout connect 40s  
    timeout server 30s  
    server www1 localhost:8084 weight 1 maxconn 2500 check  
    server www2 localhost:8085 weight 1 maxconn 2500 check 

Note:
0. Ensure you have successfully installed the HAProxy (I'm testing with haproxy-1.4.21), and then execute "haproxy -f {correct_path_for_this_conf}/haproxy.conf"

1. The port:8080 is the public proxy port for the backend 8084 and 8085 web app instances.
2. HAProxy doesn't enable log as default, you can remove "log 127.0.0.1 local0 info" firstly, and for log configs, the following links may be helpful:
   http://linuxadminzone.com/enable-or-fix-logging-for-haproxy-load-balancer/
   http://kevin.vanzonneveld.net/techblog/article/haproxy_logging/
   http://code.google.com/p/haproxy-docs/wiki/Logging#Examples_of_logs
3. The above config is a simple testing, please config refer more for your actual webapp.