之前设置了浏览器缓存

response.setHeader("Cache-Control", "no-store");

response.setHeader("Pragrma", "no-cache");

response.setDateHeader("Expires", 0);

一直报错 说请求的站点找不到，将

response.setHeader("Cache-Control", "no-store");

改成

response.setHeader("Cache-Control", "max-age=30" );

就可以了，可能是要缓存权限吧....