OWIN token authentication 400 Bad Request on OPTIONS from browser

Question

I am using token authentication for small project based on this article: http://bitoftech.net/2014/06/09/angularjs-token-authentication-using-asp-net-web-api-2-owin-asp-net-iden

Answer 1

This should do the trick:

app.UseCors(CorsOptions.AllowAll);