浏览器兼容问题

今天在ie浏览器上测试了刚开发完成的一个系统，碰到一些兼容性问题

1.width:fit-content;不起效，解决方法：写死宽度

2.跨域问题：设置响应头

response.setHeader("Access-Control-Allow-Origin", "<请求方域名如:http://www.sohu.com>");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE"); 
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type"); 
response.setHeader("Access-Control-Allow-Credentials", "true");