haproxy: configuración básica

frontend services
        bind 0.0.0.0:80
        mode http
        acl url_private path_beg /private
        acl url_public path_beg /public
        use_backend public_servers if url_public
        use_backend private_servers if url_private
        default_backend other_servers

backend public_servers
        mode http
        balance roundrobin
        option httpchk GET /health
        server public1 127.0.0.1:8000 check
        server public2 127.0.0.1:9000 check

backend private_servers
        mode http
        balance roundrobin
        option httpchk GET /health
        server private1 127.0.0.1:8500 check
        server private2 127.0.0.1:9500 check

backend other_servers
        mode http
        balance roundrobin
        option httpchk GET /health
        server other1 127.0.0.1:7000 check