ASP.Net Core - no redirect on API auth error : <p>In my ASP.NET Core project I got a few API-Controllers with jwt-authorization like this:</p>

<pre><code>[Route("api/v1/[controller]")]
public class MyController : Controller
{
  [HttpGet("[action]")]
  [Authorize(Policy = MyPolicy)]
  public JsonResult FetchAll()
  {
  }
}
</code></pre>

<p>When authorization for accessing the action FetchAll() Fails I want HttpStatusCode.Forbidden as response. Instead Mvc does a reroute to Account/Login?ReturnUrl=[...]</p>

<p>I tried to capture the Redirect-Events and return Forbidden/Unauthorized overriding the Cookie Events to no avail:</p>

<pre><code>  app.UseIdentity();

  var tokenValidationParameters = new TokenValidationParameters
  {
    ValidateIssuerSigningKey = true,
    IssuerSigningKey = TokenController.DummyKey,
    ValidateIssuer = false,
    ValidateAudience = false,
    ValidateLifetime = true,
    ClockSkew = TimeSpan.FromMinutes(0)
  };
  app.UseJwtBearerAuthentication(new JwtBearerOptions
  {
    AutomaticAuthenticate = true,
    AutomaticChallenge = true,
    TokenValidationParameters = tokenValidationParameters,
  });

  app.UseCookieAuthentication(new CookieAuthenticationOptions()
  {
    AutomaticAuthenticate = false,
    AutomaticChallenge = false,
    AuthenticationScheme = "BsCookie",
    CookieName = "access_token",
    TicketDataFormat = new CustomJwtDataFormat(SecurityAlgorithms.HmacSha256, tokenValidationParameters),
    Events = new CookieAuthenticationEvents
    {
      OnRedirectToLogin = context =&gt;
      {
        if (context.Request.Path.StartsWithSegments("/api") &amp;&amp; context.Response.StatusCode == (int)HttpStatusCode.OK)
          context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
        else
          context.Response.Redirect(context.RedirectUri);
        return Task.FromResult(0);
      },

      OnRedirectToAccessDenied = context =&gt;
      {
        if (context.Request.Path.StartsWithSegments("/api") &amp;&amp; context.Response.StatusCode == (int)HttpStatusCode.OK)
          context.Response.StatusCode = (int)HttpStatusCode.Forbidden;
        else
          context.Response.Redirect(context.RedirectUri);
        return Task.FromResult(0);
      }
    },
  });
</code></pre>

<p>Both Events are never called and the Visual Studio output Shows that fetchall Fails and Account/Login will be returned instead:</p>

<pre><code>Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request starting HTTP/1.1 GET http://localhost:6460/api/v1/Lehrer/GetAll application/json 
Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerMiddleware:Information: Successfully validated the token.
Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerMiddleware:Information: HttpContext.User merged via AutomaticAuthentication from authenticationScheme: Bearer.
Microsoft.AspNetCore.Authorization.DefaultAuthorizationService:Information: Authorization failed for user: (null).
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker:Information: Authorization failed for the request at filter 'Microsoft.AspNetCore.Mvc.Authorization.AuthorizeFilter'.
Microsoft.AspNetCore.Mvc.ChallengeResult:Information: Executing ChallengeResult with authentication schemes ().
Microsoft.AspNetCore.Authentication.JwtBearer.JwtBearerMiddleware:Information: AuthenticationScheme: Bearer was forbidden.
Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationMiddleware:Information: AuthenticationScheme: Identity.Application was challenged.
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker:Information: Executed action Sam.Learning2.Controllers.LehrerController.GetAll (Sam.Learning2) in 49.7114ms
Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request finished in 121.6106ms 302 
Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request starting HTTP/1.1 GET http://localhost:6460/Account/Login?ReturnUrl=%2Fapi%2Fv1%2FLehrer%2FGetAll  
</code></pre>

<p>I want my APIs to return 401/403 instead of redirecting to Login - how do I achieve this when above code does not work?</p>
