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<div id="preamble"><h1>Apache Module mod_proxy_wstunnel</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_wstunnel.html" title="English"> en </a></p>
</div>
<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>
<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>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>In fact the module can be used to upgrade to other protocols, you can set the <code>upgrade</code>
parameter in the <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>
directive to allow the module to accept other protocol.
NONE means you bypass the check for the header but still upgrade to WebSocket.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#proxywebsocketasync">ProxyWebsocketAsync</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#proxywebsocketasyncdelay">ProxyWebsocketAsyncDelay</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#proxywebsocketidletimeout">ProxyWebsocketIdleTimeout</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>
<li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyWebsocketAsync" id="ProxyWebsocketAsync">ProxyWebsocketAsync</a> <a name="proxywebsocketasync" id="proxywebsocketasync">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Instructs this module to try to create an asynchronous tunnel</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyWebsocketAsync ON|OFF</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>
</table>
<p>This directive instructs the server to try to create an asynchronous tunnel.
If the current MPM does not support the necessary features, a synchronous
tunnel is used.</p>
<div class="note"><h3>Note</h3><p>Async support is experimental and subject
to change.</p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyWebsocketAsyncDelay" id="ProxyWebsocketAsyncDelay">ProxyWebsocketAsyncDelay</a> <a name="proxywebsocketasyncdelay" id="proxywebsocketasyncdelay">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the amount of time the tunnel waits synchronously for data</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyWebsocketAsyncDelay <var>num</var>[ms]</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyWebsocketAsyncDelay 0</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>
</table>
<p>If <code class="directive">ProxyWebsocketAsync</code> is enabled, this directive
controls how long the server synchronously waits for more data. The timeout
is considered in seconds by default, but it is possible to increase
the time resolution to milliseconds adding the <em>ms</em> suffix.</p>
<div class="note"><h3>Note</h3><p>Async support is experimental and subject
to change. </p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyWebsocketIdleTimeout" id="ProxyWebsocketIdleTimeout">ProxyWebsocketIdleTimeout</a> <a name="proxywebsocketidletimeout" id="proxywebsocketidletimeout">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the maximum amount of time to wait for data on the websockets tunnel</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyWebsocketIdleTimeout <var>num</var>[ms]</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyWebsocketIdleTimeout 0</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>
</table>
<p>This directive imposes a maximum amount of time for the tunnel to be
left open while idle. The timeout is considered in seconds by default, but
it is possible to increase the time resolution to milliseconds
adding the <em>ms</em> suffix.</p>
</div>
</div>
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