code: public void checkRefreshXslt(final HttpServletRequest request) {
      String reqpar = request.getParameter(getRefreshXSLTRequestName());
  
      if (reqpar == null) {
        return;
      }
  
      if (reqpar.equals("yes")) {
        setForceXSLTRefresh(true);
      }
  
      if (reqpar.equals("always")) {
        setForceXSLTRefreshAlways(true);
      }
  
      if (reqpar.equals("!")) {
        setForceXSLTRefreshAlways(false);
      }
    }
docs: Allow user to indicate how we should refresh the xslt.
  
  @param request  Needed to locate session