Snake eating its tail

String userAgent = req.getHeader("User-Agent");

if (userAgent != null && userAgent.indexOf("Baiduspider") >= 0) {

  resp.sendRedirect("http://www.baidu.com/search/spider.html?please_honor_robots.txt_and_dont_waste_our_resources.http://cl-test-grid.appspot.com/robots.txt");

  return;
}