How to fix "The CORS protocol does not allow specifying a wildcard (any) origin and credentials at the same time" error

Question

I've already enabled CORS on the project in C# .net Core

In startup.cs I've added lines

...
services.AddCors();
...
app.UseCors(builder => builder
    .AllowAnyOrigin()
    .AllowAnyMethod()
    .AllowAnyHeader()
    .AllowCredentials());

But when I try to use API in another Blazor project I see in logs in my API project on Host this error

The CORS protocol does not allow specifying a wildcard (any) origin and credentials at the same time. Configure the policy by listing individual origins if credentials needs to be supported

My code in Blazor

using (HttpClient http = new HttpClient()) {
  http.DefaultRequestHeaders.Add("Authorization", "Token");
   var response = await http.GetStringAsync("https://example.com?prm=2");
   Console.WriteLine(response);
   dynamicContent = response;
}

Before I enable Cors I see another error in the browser console

What can I change for solving it?

Answer 1

I had the same issue and I removed AllowCredentials() that fixed the issue for me.