Response to preflight request doesn‘t pass access control check: The value of the ‘Access

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Response to preflight request doesn‘t pass access control check: The value of the ‘Access

错误：Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'.

处理方式：

1、转自：www.jianshu/p/ea485e5665b3

Access-Control-Allow-Credentials

 

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12019.03.31 15:17:07字数 369阅读 34,601

前后端分离的项目中肯定会碰到跨域的问题，究其原因还是为了安全。我在一个前端工程调试过程中发现，即使我后端已经允许了跨域，但是前端依然报一个跨域错误。

Access to XMLHttpRequest at 'localhost/api/admin/authorizations' from origin 'localhost:9528' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.

尝试了很多网上的方法也都没有弄清原因在哪里。索性就仔细研究一下 Access-Control-Allow-Credentials 这个头的作用，果然药到病除。这个是服务端下发到客户端的 response 中头部字段，意义是允许客户端携带验证信，例如 cookie 之类的。这样客户端在发起跨域请求的时候，不就可以携带允许的头，还可以携带验证信的头，又由于客户端是请求框架是 axios，并且手残的设置了 withCredentials: true，意思是客户端想要携带验证信头，但是我的服务端设置是 'supportsCredentials' => false, ，表示不允许携带信头，好了，错误找到了。

我们的客户端和服务端交互的时候使用的是 token，通过 Authorization头发送到服务端，并没有使用到 cookie，所以客户端没有必要设置 withCredentials: true，一顿操作猛如虎🤣🤣。

 

2、转自：wwwblogs/chen55555/p/11584785.html

跨域问题The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by t

withCredentials 属性

上面说到，CORS请求默认不发送Cookie和HTTP认证信。如果要把Cookie发到服务器，一方面要服务器同意，指定Access-Control-Allow-Credentials字段。

 

出现这个报错信很可能是你在前端设置了withCredentials = true;你可以去掉这个设置也可以参考下面两个博客

juejin.im/post/5c2490ba6fb9a049ff4e2eca

blog.csdn/nlldwbiqjs/article/details/82887180

 ningyu1.github.io/site/post/92-cors-ajax/

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