MVC 5 Web API Base Controller

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Http;

using System.Web.Mvc.Filters;

namespace myPortal.API

{

    /// <summary>

    /// Base api controller will extend to all apis. And can handle authentication and authorization here.

    /// </summary>

    public class BaseAPIController : ApiController

    {

        /// <summary>

        /// BaseAPIController constructor will check that identity exists or not.

        /// </summary>

        public BaseAPIController()

        {

            if (!HttpContext.Current.User.Identity.IsAuthenticated)

                {

                    SetHeader();

                }

        }

        /// <summary>

        /// Set header status code to 401

        /// </summary>

        public void SetHeader()

        {

            HttpResponse resp = HttpContext.Current.Response;

            resp.StatusCode = 401;

            resp.End();

        }

    }

}