haproxy.cfg

global
    maxconn 1024

defaults
    mode http
    timeout connect 5s
    timeout client 5s
    timeout server 60s

frontend all 0.0.0.0:8888
    timeout client 24h
    default_backend www_backend
    option http-server-close
    option http-pretend-keepalive
    acl is_websocket hdr(upgrade) -i websocket
    acl is_websocket hdr_beg(host) -i ws
    acl is_sio path_beg /socket.io

    use_backend socket_backend if is_sio

backend www_backend
    balance roundrobin
    option forwardfor # This sets X-Forwarded-For
    timeout server 5000
    timeout connect 4000
    server server1 localhost:8800 weight 1 maxconn 1024 check

backend socket_backend
    mode http
    balance source

    no option httpclose
    option http-server-close
    option forceclose
    option forwardfor

    timeout server 24h
    timeout connect 24h
    timeout queue 5000

    server nodejs1 127.0.0.1:8871 weight 1 maxconn 1024 check
    server nodejs2 127.0.0.1:8872 weight 1 maxconn 1024 check
    server nodejs3 127.0.0.1:8873 weight 1 maxconn 1024 check
    server nodejs4 127.0.0.1:8874 weight 1 maxconn 1024 check
    #server nodejs5 127.0.0.1:8875 weight 1 maxconn 1024 check
    #server nodejs6 127.0.0.1:8876 weight 1 maxconn 1024 check
    #server nodejs7 127.0.0.1:8877 weight 1 maxconn 1024 check
    #server nodejs8 127.0.0.1:8878 weight 1 maxconn 1024 check