eader. This only works
        if the context has the attribute <code>preemptiveAuthentication="true"</code>
        set. An already existing <code>authentication</code> header will not be
        overwritten. In effect this will trigger authentication instead of deny
        even if the application does not have a security constraint configured.</p>
        <p>This can be combined with <code>addConnectorPort</code> to trigger authentication
        depending on the client and the connector that is used to 