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  149. <h1 id="delegation-of-incoming-federation-traffic"><a class="header" href="#delegation-of-incoming-federation-traffic">Delegation of incoming federation traffic</a></h1>
  150. <p>In the following documentation, we use the term <code>server_name</code> to refer to that setting
  151. in your homeserver configuration file. It appears at the ends of user ids, and tells
  152. other homeservers where they can find your server.</p>
  153. <p>By default, other homeservers will expect to be able to reach yours via
  154. your <code>server_name</code>, on port 8448. For example, if you set your <code>server_name</code>
  155. to <code>example.com</code> (so that your user names look like <code>@user:example.com</code>),
  156. other servers will try to connect to yours at <code>https://example.com:8448/</code>.</p>
  157. <p>Delegation is a Matrix feature allowing a homeserver admin to retain a
  158. <code>server_name</code> of <code>example.com</code> so that user IDs, room aliases, etc continue
  159. to look like <code>*:example.com</code>, whilst having federation traffic routed
  160. to a different server and/or port (e.g. <code>synapse.example.com:443</code>).</p>
  161. <h2 id="well-known-delegation"><a class="header" href="#well-known-delegation">.well-known delegation</a></h2>
  162. <p>To use this method, you need to be able to configure the server at
  163. <code>https://&lt;server_name&gt;</code> to serve a file at
  164. <code>https://&lt;server_name&gt;/.well-known/matrix/server</code>. There are two ways to do this, shown below.</p>
  165. <p>Note that the <code>.well-known</code> file is hosted on the default port for <code>https</code> (port 443).</p>
  166. <h3 id="external-server"><a class="header" href="#external-server">External server</a></h3>
  167. <p>For maximum flexibility, you need to configure an external server such as nginx, Apache
  168. or HAProxy to serve the <code>https://&lt;server_name&gt;/.well-known/matrix/server</code> file. Setting
  169. up such a server is out of the scope of this documentation, but note that it is often
  170. possible to configure your <a href="reverse_proxy.html">reverse proxy</a> for this.</p>
  171. <p>The URL <code>https://&lt;server_name&gt;/.well-known/matrix/server</code> should be configured
  172. return a JSON structure containing the key <code>m.server</code> like this:</p>
  173. <pre><code class="language-json">{
  174. &quot;m.server&quot;: &quot;&lt;synapse.server.name&gt;[:&lt;yourport&gt;]&quot;
  175. }
  176. </code></pre>
  177. <p>In our example (where we want federation traffic to be routed to
  178. <code>https://synapse.example.com</code>, on port 443), this would mean that
  179. <code>https://example.com/.well-known/matrix/server</code> should return:</p>
  180. <pre><code class="language-json">{
  181. &quot;m.server&quot;: &quot;synapse.example.com:443&quot;
  182. }
  183. </code></pre>
  184. <p>Note, specifying a port is optional. If no port is specified, then it defaults
  185. to 8448.</p>
  186. <h3 id="serving-a-well-knownmatrixserver-file-with-synapse"><a class="header" href="#serving-a-well-knownmatrixserver-file-with-synapse">Serving a <code>.well-known/matrix/server</code> file with Synapse</a></h3>
  187. <p>If you are able to set up your domain so that <code>https://&lt;server_name&gt;</code> is routed to
  188. Synapse (i.e., the only change needed is to direct federation traffic to port 443
  189. instead of port 8448), then it is possible to configure Synapse to serve a suitable
  190. <code>.well-known/matrix/server</code> file. To do so, add the following to your <code>homeserver.yaml</code>
  191. file:</p>
  192. <pre><code class="language-yaml">serve_server_wellknown: true
  193. </code></pre>
  194. <p><strong>Note</strong>: this <em>only</em> works if <code>https://&lt;server_name&gt;</code> is routed to Synapse, so is
  195. generally not suitable if Synapse is hosted at a subdomain such as
  196. <code>https://synapse.example.com</code>.</p>
  197. <h2 id="srv-dns-record-delegation"><a class="header" href="#srv-dns-record-delegation">SRV DNS record delegation</a></h2>
  198. <p>It is also possible to do delegation using a SRV DNS record. However, that is generally
  199. not recommended, as it can be difficult to configure the TLS certificates correctly in
  200. this case, and it offers little advantage over <code>.well-known</code> delegation.</p>
  201. <p>However, if you really need it, you can find some documentation on what such a
  202. record should look like and how Synapse will use it in <a href="https://matrix.org/docs/spec/server_server/latest#resolving-server-names">the Matrix
  203. specification</a>.</p>
  204. <h2 id="delegation-faq"><a class="header" href="#delegation-faq">Delegation FAQ</a></h2>
  205. <h3 id="when-do-i-need-delegation"><a class="header" href="#when-do-i-need-delegation">When do I need delegation?</a></h3>
  206. <p>If your homeserver's APIs are accessible on the default federation port (8448)
  207. and the domain your <code>server_name</code> points to, you do not need any delegation.</p>
  208. <p>For instance, if you registered <code>example.com</code> and pointed its DNS A record at a
  209. fresh server, you could install Synapse on that host, giving it a <code>server_name</code>
  210. of <code>example.com</code>, and once a reverse proxy has been set up to proxy all requests
  211. sent to the port <code>8448</code> and serve TLS certificates for <code>example.com</code>, you
  212. wouldn't need any delegation set up.</p>
  213. <p><strong>However</strong>, if your homeserver's APIs aren't accessible on port 8448 and on the
  214. domain <code>server_name</code> points to, you will need to let other servers know how to
  215. find it using delegation.</p>
  216. <h3 id="should-i-use-a-reverse-proxy-for-federation-traffic"><a class="header" href="#should-i-use-a-reverse-proxy-for-federation-traffic">Should I use a reverse proxy for federation traffic?</a></h3>
  217. <p>Generally, using a reverse proxy for both the federation and client traffic is a good
  218. idea, since it saves handling TLS traffic in Synapse. See
  219. <a href="reverse_proxy.html">the reverse proxy documentation</a> for information on setting up a
  220. reverse proxy.</p>
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