The ‘Access-Control-Allow-Origin‘ header contains multiple values‘*, ....‘, but only one is allowed.

报错内容：

Access to XMLHttpRequest at 'http://www.z........n.com/api/login' 
from origin 'http://z........n.com' has been blocked by CORS policy: 
The 'Access-Control-Allow-Origin' header contains multiple values
 '*, http://z........n.com', 
but only one is allowed.

意思是：
已被CORS策略阻止：“Access Control Allow Origin”标头包含多个值*
但只有一个是允许的。

报错截图：