Custom Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Rewrite;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System.Globalization;

namespace StartupDemo
{
    #region Class :: Boost.
    /// <summary>
    /// Class: Boost.cs
    /// Abstract: Serves as the core class of the applications startup directives and features, provides container storage for services, and application pathway for launch.
    /// </summary>
    public class Boost
    {
        #region Properties
        public IConfiguration configObj { get; private set; } = null;
        #endregion

        #region Methods
        public Boost(IHostingEnvironment host)
        {
            var configObject = new ConfigurationBuilder()
                .SetBasePath(host.ContentRootPath)
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();

            configObj = configObject.Build();
        }

        /// <summary>
        /// Service container called by the runtime to provide servics.
        /// </summary>
        /// <param name="services"></param>
        public void ConfigureServices(IServiceCollection services)
        {
            // MVC
            services.AddMvc();
            services.AddCors(opts =>
            {
                opts.AddPolicy("Policy", policyBuilder =>
                {
                    policyBuilder.WithOrigins("https://backdoorsecurity.io");
                });
            });
            services.AddMemoryCache();
            services.AddSession();

            services.Configure<MvcOptions>(opt =>
            {
                opt.Filters.Add(new RequireHttpsAttribute());
            });

        }


        /// <summary>
        /// Application pipeline HTTP request pipeline that is called by the runtime to handle incoming HTTP requests...
        /// </summary>
        /// <param name="app"></param>
        public void Configure(IApplicationBuilder app)
        {

            var culturesSupported = new[] { new CultureInfo("en-US") };

            var options = new RewriteOptions()
                    .AddRedirectToHttps();
            app.UseRewriter(options);

            app.UseRequestLocalization(new RequestLocalizationOptions
            {
                DefaultRequestCulture = new RequestCulture("en-US"),
                SupportedCultures = culturesSupported,
                SupportedUICultures = culturesSupported
            });

            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();

            app.UseSession();
            app.UseStaticFiles();


            app.UseMvc(route =>
            {
                route.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}"
                    );
            });
        }

        #endregion
    }
    #endregion
}