Added HAProxy example

Proposal of an example with HAProxy. Asked by matrix-org#4541.

Signed-off-by: Benoît S. (“Benpro”) <[email protected]>

changelog.d/4541.feature

@@ -0,0 +1 @@
+Added an HAProxy example in the reverse proxy documentation. Contributed by Benoît S. (“Benpro”).

docs/reverse_proxy.rst

@@ -85,6 +85,28 @@ Let's assume that we expect clients to connect to our server at
           </Location>
       </VirtualHost>
 
+* HAProxy::
+
+      frontend https
+        bind 0.0.0.0:443 v4v6 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
+        bind :::443 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
+        
+        # A standard website
+        acl www hdr(host) -i www.example.com
+        use_backend www if www
+        
+        # Matrix-Synapse
+        acl matrix hdr(host) -i matrix.example.com
+        use_backend matrix if matrix
+        
+      frontend matrix-synapse
+        bind 0.0.0.0:8448 v4v6 ssl crt /etc/ssl/haproxy/synapse.pem alpn h2,http/1.1
+        bind :::8448 ssl crt /etc/ssl/haproxy/synapse.pem alpn h2,http/1.1
+        default_backend matrix
+        
+      backend matrix
+        server matrix 127.0.0.1:8008
+
 You will also want to set ``bind_addresses: ['127.0.0.1']`` and ``x_forwarded: true``
 for port 8008 in ``homeserver.yaml`` to ensure that client IP addresses are
 recorded correctly.