using System;

using System.Web.Http.Filters;

public class AllowCrossSiteJsonAttribute : ActionFilterAttribute

{

    public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)

    {

        if (actionExecutedContext.Response != null)

            actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Origin", "*");

        base.OnActionExecuted(actionExecutedContext);

    }

}