code: public void handle(String pathInContext,
                         String pathParams,
                         HttpRequest request,
                         HttpResponse response)
              throws HttpException,IOException
      {
          log.debug("SetResponseHeadersHandler.handle()");
  
          for (Iterator iterator=_fields.entrySet().iterator();iterator.hasNext();)
          {
              Map.Entry entry=(Map.Entry)iterator.next();
              String name=(String)entry.getKey();
              List values=(List)entry.getValue();
              response.setField(name,values);
          }
      }
docs: Handle a request by pre-populating the headers from the configured
  set of _fields.
  
  Settings made here can be overridden by subsequent handling of the
  request.
  
  @param pathInContext The context path. Ignored.
  @param pathParams Path parameters such as encoded Session ID. Ignored.
  @param request The HttpRequest request. Ignored.
  @param response The HttpResponse response. Updated with new Headers.