Startup class for dot net core kestrel

Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebServer.Main
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection serviceCollection)
        {
            serviceCollection.AddDirectoryBrowser();
            serviceCollection.AddMvc().AddJsonOptions(options =>
            {
                options.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
            });
        }

        public void Configure(IApplicationBuilder appBuilder)
        {
            appBuilder.UseFileServer(enableDirectoryBrowsing: true);
            appBuilder.UseMvc();
        }
    }
}