Question 85712 in ASP.NET Question posted in
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The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. cors error not resolving – Asp.net

Access to XMLHttpRequest at
‘https://apicredit2fa.devserver.co.in/api/adminaccount/signin’ from
origin ‘http://localhost:3000’ has been blocked by CORS policy

Response to preflight request doesn’t pass access control check: The ‘Access-Control-Allow-Origin’ header contains multiple values ‘*, *’, but only one is allowed.

I cofigured the default cores and using middleware app.UseCors(); as well

I tried with fixed cores but getting * and core name . multiple error remains

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3

Answers


  1. Chosen as BEST ANSWER
    0

    issue resolved. problem was nginx proxy server that was adding extra header value.


  2. 0

    Hello you can try this

    services.AddCors(options =>
            {
                options.AddPolicy("CorsPolicy",
                    builder => builder.AllowAnyOrigin()
                        .AllowAnyMethod()
                        .AllowAnyHeader());
            });

    and below consume this policy It works

    app.UseCors("CorsPolicy");
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  3. 0

    The error

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

    indicates there’re mutipule 'Access-Control-Allow-Origin' in your response headers

    and if you configured AllowAnyOrigin() when you regist cros,it would add 'Access-Control-Allow-Origin' :"*" to your response header,
    try remove AllowAnyOrigin() and observe if there’re any other error or check if you added the header anwhere else again

    If you still have problem,please show us a minimal example that could reproduce the error

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