How to enable cross origin requests in ASP.NET MVC [duplicate]

Answer 1

I think you have to add it into "OnAuthentication" step or add config into your web config. You can try my code :) it works

 public class AllowCrossSiteJsonAttribute : ActionFilterAttribute, IAuthorizationFilter
    {
        public void OnAuthorization(AuthorizationContext filterContext)
        {
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "*");
        }

    }