CORS in ASP .NET MVC5

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As described in here: Setting Access-Control-Allow-Origin in ASP.Net MVC – simplest possible method

You should just create an action filter and set the headers there. You can use this action filter on your action methods wherever you want. 

public class AllowCrossSiteJsonAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "*");
        base.OnActionExecuting(filterContext);
    }
}

If you want to add multiple domains, you can’t just set the header multiple times. In your action filter you will need to check if the requesting domain is from your list of domains and then set the header.

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var domains = new List<string> {"domain2.com", "domain1.com"};

        if (domains.Contains(filterContext.RequestContext.HttpContext.Request.UrlReferrer.Host))
        {
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "*");
        }

        base.OnActionExecuting(filterContext);
    }

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