ASP.NET Core 2.0 disable automatic challenge

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As pointed out by some of the other answers, there is no longer a setting to turn off automatic challenge with cookie authentication. The solution is to override OnRedirectToLogin:

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
        .AddCookie(options =>
         {                 
             options.Events.OnRedirectToLogin = context =>
             {
                 context.Response.Headers["Location"] = context.RedirectUri;
                 context.Response.StatusCode = 401;
                 return Task.CompletedTask;
             };
         });

This may change in the future: https://github.com/aspnet/Security/issues/1394

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