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

忘是亡心i 2022-04-12 11:41 132阅读 0赞

使用Ajax跨域请求资源，Nginx作为代理，出现：The 'Access-Control-Allow-Origin' header contains multiple values '\*, \*', but only one is allowed 错误。

服务端允许跨域配置：

\#region 设置允许跨域，允许复杂请求  
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "\*");  
            if (HttpContext.Current.Request.HttpMethod == "OPTIONS")  
            \{  
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,PATCH,OPTIONS");  
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept, Authorization");  
                //HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");  
                HttpContext.Current.Response.End();  
            \}  
            \#endregion  
Nginx的配置：

add\_header 'Access-Control-Allow-Origin' '\*';  
        location / \{  
            if ($request\_method = 'OPTIONS') \{  
            add\_header Access-Control-Allow-Origin \*;  
                add\_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,PATCH,OPTIONS;  
                return 200;  
            \}  
            proxy\_pass http://xx:8002/;  
            \#proxy\_pass http://localhost:62249/;  
        \}  
看上面错误提示，contains multiple values "\*" 意思就是设置了2次跨域，但是只有一个是允许的，移除其中的任意一个就好了。如果服务器设置了允许跨域，使用Nginx代理里面就不需要了（或者就不用使用Nginx了）

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

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