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+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
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+
+                        <h1 id="using-a-forward-proxy-with-synapse"><a class="header" href="#using-a-forward-proxy-with-synapse">Using a forward proxy with Synapse</a></h1>
+<p>You can use Synapse with a forward or outbound proxy. An example of when
+this is necessary is in corporate environments behind a DMZ (demilitarized zone).
+Synapse supports routing outbound HTTP(S) requests via a proxy. Only HTTP(S)
+proxy is supported, not SOCKS proxy or anything else.</p>
+<h2 id="configure"><a class="header" href="#configure">Configure</a></h2>
+<p>The <code>http_proxy</code>, <code>https_proxy</code>, <code>no_proxy</code> environment variables are used to
+specify proxy settings. The environment variable is not case sensitive.</p>
+<ul>
+<li><code>http_proxy</code>: Proxy server to use for HTTP requests.</li>
+<li><code>https_proxy</code>: Proxy server to use for HTTPS requests.</li>
+<li><code>no_proxy</code>: Comma-separated list of hosts, IP addresses, or IP ranges in CIDR
+format which should not use the proxy. Synapse will directly connect to these hosts.</li>
+</ul>
+<p>The <code>http_proxy</code> and <code>https_proxy</code> environment variables have the form: <code>[scheme://][&lt;username&gt;:&lt;password&gt;@]&lt;host&gt;[:&lt;port&gt;]</code></p>
+<ul>
+<li>
+<p>Supported schemes are <code>http://</code> and <code>https://</code>. The default scheme is <code>http://</code>
+for compatibility reasons; it is recommended to set a scheme. If scheme is set
+to <code>https://</code> the connection uses TLS between Synapse and the proxy.</p>
+<p><strong>NOTE</strong>: Synapse validates the certificates. If the certificate is not
+valid, then the connection is dropped.</p>
+</li>
+<li>
+<p>Default port if not given is <code>1080</code>.</p>
+</li>
+<li>
+<p>Username and password are optional and will be used to authenticate against
+the proxy.</p>
+</li>
+</ul>
+<p><strong>Examples</strong></p>
+<ul>
+<li>HTTP_PROXY=http://USERNAME:PASSWORD@10.0.1.1:8080/</li>
+<li>HTTPS_PROXY=http://USERNAME:PASSWORD@proxy.example.com:8080/</li>
+<li>NO_PROXY=master.hostname.example.com,10.1.0.0/16,172.30.0.0/16</li>
+</ul>
+<p><strong>NOTE</strong>:
+Synapse does not apply the IP blacklist to connections through the proxy (since
+the DNS resolution is done by the proxy). It is expected that the proxy or firewall
+will apply blacklisting of IP addresses.</p>
+<h2 id="connection-types"><a class="header" href="#connection-types">Connection types</a></h2>
+<p>The proxy will be <strong>used</strong> for:</p>
+<ul>
+<li>push</li>
+<li>url previews</li>
+<li>phone-home stats</li>
+<li>recaptcha validation</li>
+<li>CAS auth validation</li>
+<li>OpenID Connect</li>
+<li>Outbound federation</li>
+<li>Federation (checking public key revocation)</li>
+<li>Fetching public keys of other servers</li>
+<li>Downloading remote media</li>
+</ul>
+<p>It will <strong>not be used</strong> for:</p>
+<ul>
+<li>Application Services</li>
+<li>Identity servers</li>
+<li>In worker configurations
+<ul>
+<li>connections between workers</li>
+<li>connections from workers to Redis</li>
+</ul>
+</li>
+</ul>
+<h2 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h2>
+<p>If a proxy server is used with TLS (HTTPS) and no connections are established,
+it is most likely due to the proxy's certificates. To test this, the validation
+in Synapse can be deactivated.</p>
+<p><strong>NOTE</strong>: This has an impact on security and is for testing purposes only!</p>
+<p>To deactivate the certificate validation, the following setting must be added to
+your <a href="../usage/configuration/homeserver_sample_config.html">homserver.yaml</a>.</p>
+<pre><code class="language-yaml">use_insecure_ssl_client_just_for_testing_do_not_use: true
+</code></pre>
+
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+        <script type="text/javascript" src="../docs/website_files/table-of-contents.js"></script>
+        <script type="text/javascript" src="../docs/website_files/version-picker.js"></script>
+        <script type="text/javascript" src="../docs/website_files/version.js"></script>
+    </body>
+</html>