using System;

public class Program

{

    public static void Main()

    {

        AssertEqual(ForceHttps("http://server.com:8080/") , "https://server.com:8080/");

        AssertEqual(ForceHttps("http://server.com/")      , "https://server.com/");

        AssertEqual(ForceHttps("https://server.com:8433/"), "https://server.com:8433/");

        AssertEqual(ForceHttps("https://server.com/")     , "https://server.com/");

        Console.WriteLine("Hello World!");

    }

    private static string ForceHttps(string requestUrl)

    {

        var uri = new UriBuilder(requestUrl);

        var hadDefaultPort = uri.Uri.IsDefaultPort;

        uri.Scheme = Uri.UriSchemeHttps;

        uri.Port = hadDefaultPort ? -1 : uri.Port;

        return uri.ToString();

    }

    private static void AssertEqual(string actual, string expected)

    {

        if (expected != actual)

            throw new Exception($"Assert failed with '{actual}' != '{expected}'");

    }

}