From 379d2a8c3918557bacdadea6b508bddd1ce20eaf Mon Sep 17 00:00:00 2001
From: dstipp <dstipp@users.noreply.github.com>
Date: Tue, 17 Sep 2019 07:55:29 -0400
Subject: (#5849) Convert rst to markdown (#6040)

Converting some of the rst documentation to markdown.  Attempted to
preserve whitespace and line breaks to minimize cosmetic change.
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+# Using a reverse proxy with Synapse
+
+It is recommended to put a reverse proxy such as
+[nginx](https://nginx.org/en/docs/http/ngx_http_proxy_module.html),
+[Apache](https://httpd.apache.org/docs/current/mod/mod_proxy_http.html),
+[Caddy](https://caddyserver.com/docs/proxy) or
+[HAProxy](https://www.haproxy.org/) in front of Synapse. One advantage
+of doing so is that it means that you can expose the default https port
+(443) to Matrix clients without needing to run Synapse with root
+privileges.
+
+> **NOTE**: Your reverse proxy must not `canonicalise` or `normalise`
+the requested URI in any way (for example, by decoding `%xx` escapes).
+Beware that Apache *will* canonicalise URIs unless you specifify
+`nocanon`.
+
+When setting up a reverse proxy, remember that Matrix clients and other
+Matrix servers do not necessarily need to connect to your server via the
+same server name or port. Indeed, clients will use port 443 by default,
+whereas servers default to port 8448. Where these are different, we
+refer to the 'client port' and the \'federation port\'. See [Setting
+up federation](federate.md) for more details of the algorithm used for
+federation connections.
+
+Let's assume that we expect clients to connect to our server at
+`https://matrix.example.com`, and other servers to connect at
+`https://example.com:8448`.  The following sections detail the configuration of
+the reverse proxy and the homeserver.
+
+## Webserver configuration examples
+
+> **NOTE**: You only need one of these.
+
+### nginx
+
+        server {
+            listen 443 ssl;
+            listen [::]:443 ssl;
+            server_name matrix.example.com;
+
+            location /_matrix {
+                proxy_pass http://localhost:8008;
+                proxy_set_header X-Forwarded-For $remote_addr;
+            }
+        }
+
+        server {
+            listen 8448 ssl default_server;
+            listen [::]:8448 ssl default_server;
+            server_name example.com;
+
+            location / {
+                proxy_pass http://localhost:8008;
+                proxy_set_header X-Forwarded-For $remote_addr;
+            }
+        }
+
+> **NOTE**: Do not add a `/` after the port in `proxy_pass`, otherwise nginx will
+canonicalise/normalise the URI.
+
+### Caddy
+
+        matrix.example.com {
+          proxy /_matrix http://localhost:8008 {
+            transparent
+          }
+        }
+
+        example.com:8448 {
+          proxy / http://localhost:8008 {
+            transparent
+          }
+        }
+
+### Apache
+
+        <VirtualHost *:443>
+            SSLEngine on
+            ServerName matrix.example.com;
+
+            AllowEncodedSlashes NoDecode
+            ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
+            ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
+        </VirtualHost>
+
+        <VirtualHost *:8448>
+            SSLEngine on
+            ServerName example.com;
+
+            AllowEncodedSlashes NoDecode
+            ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
+            ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
+        </VirtualHost>
+
+> **NOTE**: ensure the  `nocanon` options are included.
+
+### HAProxy
+
+        frontend https
+          bind :::443 v4v6 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
+
+          # Matrix client traffic
+          acl matrix-host hdr(host) -i matrix.example.com
+          acl matrix-path path_beg /_matrix
+
+          use_backend matrix if matrix-host matrix-path
+
+        frontend matrix-federation
+          bind :::8448 v4v6 ssl crt /etc/ssl/haproxy/synapse.pem alpn h2,http/1.1
+          default_backend matrix
+
+        backend matrix
+          server matrix 127.0.0.1:8008
+
+## Homeserver Configuration
+
+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.
+
+Having done so, you can then use `https://matrix.example.com` (instead
+of `https://matrix.example.com:8448`) as the "Custom server" when
+connecting to Synapse from a client.
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