目的：
使用.netcore自带的kestrel加载自己指定的ssl
实验版本

• aspnet core 2.2
• aspnet core 3.1
  首先准备ssl文件：（密码为：123456）
  
  代码如下：

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 server
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
            .UseUrls("https://*:5001")
            .UseKestrel(option =>
            {
                option.ConfigureHttpsDefaults(i =>
                {
                    i.ServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2("./ssl.pfx", "123456");
                });
            }).UseStartup<Startup>();
    }
}