undertow.xml

<subsystem xmlns="urn:jboss:domain:io:1.0">
    <xnio-worker name="default" task-core-threads="12" io-threads="3"/>
    <xnio-buffer-pool name="default" buffer-size="1024" buffers-per-slice="1024"/>
</subsystem>

<subsystem xmlns="urn:jboss:domain:undertow:1.0">
    <server name="foo">
        <http-listener name="default" socket-binding="http" worker="default" buffer-pool="default"/>
        <ajp-listener name="ajp-connector" socket-binding="ajp"/>
    
        <!-- each host is a sub-resource -->
        <host name="localhost" aliases="www.localhost localhost.localdomain">
            <!-- each location is a sub-resource -->
            <location name="/app/myData" handler="opt-file-handler">
                <filter name="security-other"/>
                <filter name="headers"/>
            </location>
        </host>
        <host name="www.mysite.com">
            <location name="/" handler="redirect-1">
                <filter name="security-other"/>
            </location>
        </host>
        <host name="disallowed-site.com">
            <error-page code="404" path="/opt/data/custom/404.html"/>
        </host>
    
        <default-host>
        </default-host>
    
        <error-handlers>
            <error-page code="404" path="/opt/data/404.html"/>
        </error-handlers>
    
        <servlet-container name="default">
            <jsp-config>.....</jsp-config>
        </servlet-container>
    
        <filters>
            <basic-auth name="security-other" security-domain="other"/>
            <response-header name="headers" header-name="MY_HEADER" header-value="someValue"/>
        </filters>
    
        <handlers>
            <file name="opt-file-handler" path="/opt/data" cache-buffer-size="1024" cache-buffers="1024"/>
        </handlers>
    </server>
</subsystem>