monero.fail/xmrnodes/templates/haproxy.html

defaults
  mode http
  timeout client 10s
  timeout connect 5s
  timeout server 10s 
  timeout http-request 10s

frontend frontend
  bind :8080
  default_backend nodes

backend nodes
    balance roundrobin
    option httpchk GET /get_info
    {% for node in nodes -%}
      server backend-{{ node.id }} {{ node.get_netloc() }} check inter 10s fall 5 rise 5
    {% endfor %}