Hiding X-Powered by on JBoss Application Server 4.22.x Rumi, April 20, 2012 JBoss can add headers in the HTTP response. The X-Powered-By header exposes what implementation is behind your site. This header is created by a servlet filter that is activated by default in JBoss web configuration files (…/usr/java/jboss-4.2.2.GA/server/default/deploy/jboss-web.deployer/conf/web.xml). You can either disable this filter by commenting the following lines: <filter> <filter-name>CommonHeadersFilter</filter-name> <filter-class>org.jboss.web.tomcat.filters.ReplyHeaderFilter</filter-class> <init-param> <param-name>X-Powered-By</param-name> <param-value>Servlet 2.4; JBoss-4.2.2.GA (build: SVNTag=JBoss_4_2_2_GA date=200710221139)/Tomcat-5.5</param-value> </init-param> </filter> Now update <param-value> at your wish 🙂 Configurations (Linux) JBoss