js请求头跨域问题

Question

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 400.

response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

所有设置为*号也是不行

Answer 1

请参考：不要再问我跨域的问题了

Answer 2

你得让后台设置成*啊

Answer 3

后端改起来很容易

Answer 4

从目前的信息只能猜测是你的request header origin 没有设置。 请你检查一下， 如果设置了，请你贴图然后更新下问题