Real pre-authentication with JsonRpcClient from Jayrock against Nutshell CRM

Program.cs

// https://groups.google.com/forum/?fromgroups#!topic/jayrock/FQjHPb_QswU

using System;
using System.Net;
using System.Text;

static class Program
{
    static void Main()
    {
        var client = new JsonRpcClient
        {
            Url = "https://app01.nutshell.com/api/v1/json",
            PreAuthenticate = true,
            Credentials = new NetworkCredential("jim@demo.nutshell.com", "43c789d483fd76547b1f157e3cf5e580b95b9d8c"),
        };
        var lead = client.Invoke(typeof(object), "getLead", new { leadId = 1000 });
        Console.WriteLine(lead);
    }
}

public class JsonRpcClient : Jayrock.JsonRpc.JsonRpcClient 
{
    protected override WebRequest GetWebRequest(Uri url)
    {
        var request = base.GetWebRequest(url);
        NetworkCredential creds;
        if (PreAuthenticate && null != (creds = Credentials.GetCredential(url, "Basic")))
        {
            var basicCreds = creds.UserName + ":" + creds.Password;
            var credsBytes = Encoding.UTF8.GetBytes(basicCreds);
            var encodedCreds = Convert.ToBase64String(credsBytes);
            request.Headers["Authorization"] = "Basic " + encodedCreds;
        }
        return request;
    }
}