haproxy.cfg

defaults
        log     global
        maxconn 4096
        mode    http
        option  httplog
        option  dontlognull
        option  forwardfor
        option  http-server-close
        timeout connect 5000
        timeout client  50000
        timeout server  50000
        stats   enable
        stats   auth yourusername:yourpassword
        stats   uri     /yourhaproxy?status
        daemon

frontend http-in
        bind :80
        default_backend web-app

backend web-app
        balance leastconn
        option  httpclose
        cookie  YOURSESSIONID prefix
        server node1 127.0.0.1:8080 cookie A check