using System;

public class Program

{

    public static void Main()

    {

        var defaultPort = new Uri("http://arcgis.com/foo");

        Console.WriteLine(defaultPort.Authority);

        var defaultHttpsPort = new Uri("https://arcgis.com/foo");

        Console.WriteLine(defaultHttpsPort.Authority);

        var customPort = new Uri("https://dev123.esri.com:8080/foo");

        Console.WriteLine(customPort.Authority);

    }

}