Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace STS
{
    public class Program
    {
        public static void Main(string[] args)
        {
            try
            {
                DotNetEnv.Env.Load();
            }
            catch (Exception)
            {
                Console.WriteLine("No .env file found");
            }
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseStartup<Startup>()
                .UseUrls($"http://*:{Environment.GetEnvironmentVariable("PORT") ?? "5555"}")
                .Build();
    }
}