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<title>mod_proxy_wstunnel - Apache HTTP Server Version 2.4</title>
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<p class="apache">Apache HTTP Server Version 2.4</p>
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<a href="https://www.apache.org/">Apache</a> > <a href="https://httpd.apache.org/">HTTP Server</a> > <a href="https://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div>
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<div id="preamble"><h1>Apache Module mod_proxy_wstunnel</h1>
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_wstunnel.html" title="English"> en </a> |
<a href="../fr/mod/mod_proxy_wstunnel.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Websockets support module for
<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_wstunnel_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_wstunnel.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.5 and later</td></tr></table>
<h3>Summary</h3>
<div class="warning"><h3><a id="deprecation" name="deprecation">Deprecation</a></h3>
<p>Since Apache HTTP Server 2.4.47, protocol Upgrade (tunneling) can be better handled by
<code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code>.</p>
<p>See <a href="mod_proxy.html#protoupgrade">Protocol Upgrade</a>.</p>
</div>
<p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>.
It provides support for the tunnelling of web
socket connections to a backend websockets server. The connection
is automatically upgraded to a websocket connection:</p>
<div class="example"><h3>HTTP Response</h3><pre class="prettyprint lang-config">Upgrade: WebSocket
Connection: Upgrade</pre>
</div>
<p>Proxying requests to a websockets server like <code>echo.websocket.org</code> can be done using the
<code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive:</p>
<pre class="prettyprint lang-config">ProxyPass "/ws2/" "ws://echo.websocket.org/"
ProxyPass "/wss2/" "wss://echo.websocket.org/"</pre>
<p>Proxying both HTTP and websockets at the same time, with a specific set of URL's being
websocket-only, can be done by specifying the websockets
<code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive before the
HTTP directive:</p>
<pre class="prettyprint lang-config">ProxyPassMatch ^/(myApp/ws)$ ws://backend.example.com:9080/$1
ProxyPass / http://backend.example.com:9080/</pre>
<p>Proxying both HTTP and websockets at the same time, where the websockets URL's are not
websocket-only or not known in advance can be done by using the
<code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directive to
configure the websockets proxying:</p>
<pre class="prettyprint lang-config">ProxyPass / http://example.com:9080/
RewriteEngine on
RewriteCond %{HTTP:Upgrade} websocket [NC]
RewriteCond %{HTTP:Connection} upgrade [NC]
RewriteRule ^/?(.*) "ws://example.com:9080/$1" [P,L]</pre>
<p>Load balancing for multiple backends can be achieved using <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>.</p>
<p>
The module can also be used to upgrade to other protocols than WebSocket, by setting
the <var><a href="mod_proxy.html#upgrade">upgrade</a></var> parameter in the
<code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>
directive to some custom protocol name.
Special <code>upgrade=NONE</code> and <code>upgrade=ANY</code> values may be used for
testing/forcing the upgrade but they are <strong>not recommended</strong> in production for
security reasons.
<code>NONE</code> means that the check for the header is omitted but still the upgrade/tunneling to
WebSocket always happens.
<code>ANY</code> means that the upgrade/tunneling will happen using any protocol asked by the client.
</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif"> <a href="#proxywebsocketfallbacktoproxyhttp">ProxyWebsocketFallbackToProxyHttp</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_wstunnel">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_wstunnel">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="directive-section"><h2 id="proxywebsocketfallbacktoproxyhttp"><span id="ProxyWebsocketFallbackToProxyHttp">ProxyWebsocketFallbackToProxyHttp</span> Directive <a title="Permanent link" href="#proxywebsocketfallbacktoproxyhttp" class="permalink">¶</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Instructs this module to let <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> handle the request</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyWebsocketFallbackToProxyHttp On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyWebsocketFallbackToProxyHttp On</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_wstunnel</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.48 and later</td></tr>
</table>
<p>Since httpd 2.4.47, <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> can handle WebSocket
upgrading and tunneling in accordance to RFC 7230, this directive controls
whether <code class="module"><a href="../mod/mod_proxy_wstunnel.html">mod_proxy_wstunnel</a></code> should hand over to
<code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> to this, which is the case by default.</p>
<p>Setting to <em>Off</em> lets <code class="module"><a href="../mod/mod_proxy_wstunnel.html">mod_proxy_wstunnel</a></code> handle
WebSocket requests as in httpd 2.4.46 and earlier.</p>
</div>
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