1 public class Program
 2     {
 3         public static void Main(string[] args)
 4         {
 5             var config = new ConfigurationBuilder()
 6                .SetBasePath(Directory.GetCurrentDirectory())
 7                .AddJsonFile("hosting.json", optional: true)
 8                .Build();
 9 
10             WebHost.CreateDefaultBuilder(args)
11                .UseKestrel()
12                .UseConfiguration(config)
13                .UseContentRoot(Directory.GetCurrentDirectory())
14                .UseIISIntegration()
15                .UseStartup<Startup>()
16                .Build()
17                .Run();
18         }
19         
20     }

{
  "server.urls": "http://*:8000"
}