[#haproxy-dns]
= HAProxy

:proxy: HAProxy
include::partial$reverse-proxies/diagram.adoc[]

This is a straightforward example of how to setup a DNS name based HAProxy setup for OliveTin.

./etc/haproxy/haproxy.conf
[source,python]
----
frontend cleartext_frontend
    bind 0.0.0.0:80

    option httplog

    use_backend be_olivetin_webs if { hdr(Host) -i olivetin.example.com && path_beg /websocket }
    use_backend be_olivetin_http if { hdr(Host) -i olivetin.example.com }

backend be_olivetin_http
    server olivetinServer 127.0.0.1:1337 check

backend be_olivetin_webs
    timeout tunnel 1h
    option http-server-close
    server olivetinServer 127.0.0.1:1337
----

The `timeout tunnel 1h` is important: without it, HAProxy's default timeouts will close long-lived websocket connections. See xref:troubleshooting/err-websocket-connection.adoc#reverse-proxies-will-close-websockets[Reverse proxies will close websockets] if you see disconnects.