Hi Folks, I was using the filter: org.keycloak.adapters.saml.servlet.SamlFilter in our application. I got the following exception in the logs: ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/].[AppName]] Servlet.service() for servlet NasDefault threw exception: java.lang.RuntimeException: This method is not supported in a restored authenticated request at org.keycloak.adapters.servlet.FilterSessionStore$1.getDateHeader(FilterSessionStore.java:178) [:1.7.0.CR1] at org.apache.catalina.servlets.DefaultServlet.checkIfModifiedSince(DefaultServlet.java:1731) [:] at org.apache.catalina.servlets.DefaultServlet.checkIfHeaders(DefaultServlet.java:608) [:] at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:714) [:] at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:368) [:] at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [:1.0.0.Final] at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:] ... (trimmed) ... at org.keycloak.adapters.saml.servlet.SamlFilter.doFilter(SamlFilter.java:125) [:1.7.0.CR1] ...(trimmed) ... etc. After looking into the Keycloak code base, I saw the method (implemented in an anonymous class): javax.servlet.http.HttpServletRequestWrapper#getDateHeader inside the class: org.keycloak.adapters.servlet.FilterSessionStore The code was: @Override public long getDateHeader(String name) { if (!needRequestRestore) return super.getDateHeader(name); throw new RuntimeException("This method is not supported in a restored authenticated request"); } Looks like a particular case isn't implemented yet, and an exception is thrown. After looking into the JEE API at: http://docs.oracle.com/javaee/7/api/javax/servlet/http/HttpServletRequest... It is required that any class implementing HttpServletRequest getDateHeader() method, return a -1 in case it cannot get the required header. Hence, I suggest that instead of throwing an exception to handle the error condition, we should return -1. *Any help appreciated.* Thanks, Regards, Akshay