Global.asax.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace WebApplication5
{
    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }

        public override void Init()
        {
            EndRequest += (sender, args) =>
            {
                var res = HttpContext.Current.Response;

                // enable cache-control injection if caching strategy has not been setted manually
                if (!res.Headers.AllKeys.Any(x => x.Equals("Cache-Control", StringComparison.InvariantCultureIgnoreCase)))
                {
                    res.Headers.Add("Cache-Control", "no-cache, no-store, must-revalidate");
                    Debug.WriteLine("The Cache-Control was been added.");
                }

                Debug.WriteLine("The Cache-Control header is exists.");
            };

            base.Init();
        }
    }
}