Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

namespace Blog.Core.AdminMvc
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((hostingContext, config) =>
                {
                    config.AddJsonFile("appsettings.gw.json", optional: true, reloadOnChange: false)
                        .AddJsonFile($"appsettings.gw.{hostingContext.HostingEnvironment.EnvironmentName}.json", optional: true, reloadOnChange: false)
                        .AddJsonFile("ocelot.json", optional: true, reloadOnChange: true)
                        .AddJsonFile($"ocelot.{hostingContext.HostingEnvironment.EnvironmentName}.json", true, true);
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>().UseUrls("http://*:9000");
                });
    }
}