cas-service-ja/overlays/org.apereo.cas.cas-server-webapp-tomcat-5.3.16/WEB-INF/classes/templates/protocol/2.0/casProxyFailureView.html

<cas:serviceResponse xmlns:cas='http://www.yale.edu/tp/cas' th:inline="text">
    <cas:proxyFailure th:attr="code=${code}">[[${description}]]</cas:proxyFailure>
</cas:serviceResponse>