2.4.x/docs/manual/mod/mod_proxy_wstunnel.xml

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<modulesynopsis metafile="mod_proxy_wstunnel.xml.meta">

<name>mod_proxy_wstunnel</name>
<description>Websockets support module for
<module>mod_proxy</module></description>
<status>Extension</status>
<sourcefile>mod_proxy_wstunnel.c</sourcefile>
<identifier>proxy_wstunnel_module</identifier>
<compatibility>Available in httpd 2.4.5 and later</compatibility>

<summary>
    <p>This module <em>requires</em> the service of <module
    >mod_proxy</module>. 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>

    <example><title>HTTP Response</title>
        <highlight language="config">
Upgrade: WebSocket
Connection: Upgrade
        </highlight>
    </example>

<p>Proxying requests to a websockets server like <code>echo.websocket.org</code> can be done using the
<directive type="ProxyPass" module="mod_proxy">ProxyPass</directive> directive:</p>
    <highlight language="config">
ProxyPass "/ws2/"  "ws://echo.websocket.org/"
ProxyPass "/wss2/" "wss://echo.websocket.org/"
    </highlight>

<p>Load balancing for multiple backends can be achieved using <module>mod_proxy_balancer</module>.</p>
</summary>

<seealso><module>mod_proxy</module></seealso>
</modulesynopsis>