code: public RequestDispatcher getNamedDispatcher(String name)
      {
          if (name == null || name.length()==0)
              name=__DEFAULT_SERVLET;
  
          try { return new Dispatcher(ServletHandler.this,name); }
          catch(Exception e) {LogSupport.ignore(log,e);}
          
          return null;
      }
docs: Get Named dispatcher.
  @param name The name of the servlet. If null or empty string, the
  containers default servlet is returned.
  @return Request dispatcher for the named servlet.