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 =         


        

Answer 1

It's little bit late, but I hope it could be helpful for someone.

If you want AllowCredentials() and AllowAnyOrigin() together just use SetIsOriginAllowed(Func predicate)

doc about IsOriginAllowed

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

                options.AddPolicy("signalr",
                    builder => builder
                    .AllowAnyMethod()
                    .AllowAnyHeader()

                    .AllowCredentials()
                    .SetIsOriginAllowed(hostName => true));
            });