System.Net.Http.MembershipAuthenticationHandler.Unauthorized C# (CSharp) Method

        private void Unauthorized()
        {
            // HACK: Prevent ASP.NET Forms Authentication to redirect the user to the login page.
            // This thread-safe approach adds a header with the suppression to be read on the
            // OnEndRequest event of the pipelien. In order to fully support the supression you should have the ASP.NET Module
            // that does this (SuppressFormsAuthenticationRedirectModule).
            var response = new HttpResponseMessage(System.Net.HttpStatusCode.Unauthorized);
            response.Headers.Add(SuppressFormsAuthenticationRedirectModule.SuppressFormsHeaderName, "true");

            throw new HttpResponseException(response);
        }