code: public void bindServer(HttpServletRequest request, HttpServletResponse response) {
          if (isLegal(request)) {
              try {
                  PrintWriter pw = response.getWriter();
                  pw.write(request.getParameter("echostr"));
                  pw.flush();
                  pw.close();
              } catch (Exception e) {
                  LOG.error("绑定服务器异常", e);
              }
          }
      }
docs: 绑定服务器的方法
  @param request 请求
  @param response 响应