source: OpenRLabs-Git/guacamole-websocket/src/main/webapp/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
                        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- Basic config -->
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>


    <!-- Guacamole Tunnel WebSocket -->
    <servlet>
        <description>tunnel-websocket</description>
        <servlet-name>tunnel-websocket</servlet-name>
        <servlet-class>
                org.apache.guacamole.net.websocket.WebSocket
        </servlet-class>
        <!--
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>    
        -->
    </servlet>
<!--
    <servlet-mapping>
        <servlet-name>tunnel-websocket</servlet-name>
        <url-pattern>/tunnel-websocket</url-pattern>
    </servlet-mapping>
-->
</web-app>