php后端接口无法跨域

Question

已经在php接口文件中添加：

header("Access-Control-Allow-Origin:*");
header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');

然而前端调用接口请求数据时仍然报错：

Failed to load http://aaa.com/version?test=1: Redirect from 'http://aaa.com/version?test=1' to 'http://bbb.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://ccc.com' is therefore not allowed access.

Answer 1

你可以使用callback的方式去解决前端的跨域问题

Answer 2

你设置的 Access-Control-Allow-Origin 得看你的Response Headers有没有
有些框架会覆盖你的设置

还要设置
Access-Control-Allow-Method: GET POST OPTIONS PUT

Answer 3

你header都没加上， *前面少个空格