微信公众号回复消息，一直报“该公众号提供的服务器出现故障，请稍后重试”

<xml><Content>你好</Content><CreateTime>1623838084849</CreateTime><ToUserName>发送者的openid</ToUserName><FromUserName>appid(这个就不显示了)</FromUserName><MsgType>text</MsgType></xml>

response.setContentType("text/xml;charset=UTF-8");
response.setCharacterEncoding("utf-8");
response.getWriter().write(code);
response.getWriter().close(); 以HttpServletResponse response 返回的