Return 401 instead of redirecting identityserver

Question

I use ASP.NET Core for an api and can not find a way to configure identity to return a 401 instead of redirecting to the login page. I use the IdentityServerAuthentication Middleware.

In the Startup.cs, I give these options:

        var options = new IdentityServerAuthenticationOptions
        {
            Authority = Configuration.GetConnectionString("Authority"),
            ScopeName = "scopeName",
            RequireHttpsMetadata = false,

        };
        app.UseIdentityServerAuthentication(options);

Answer 1

I find a solution, In the request, you can add a header X-Requested-With with a value of XMLHttpRequest. This will tell identity to not redirect to the login page.