The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:8065, http://localhost:8065', but only one is allowed.

The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:8065, http://localhost:8065', but only one is allowed.

把后端的设置修改之后，仍然出现这个错误，把项目clean+install 一下好了

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原文地址：https://www.cnblogs.com/wangdongpython/p/14717892.html