I want remove/hide HttpResponse header in Struts 1.0

I have tried below in web.xml but no working

<context-param>
   <param-name>com.sun.faces.sendPoweredByHeader</param-name>
   <param-value>false</param-value>
 </context-param>

I want to do it at application level, How I can do it Programmatically or in configuration file ?