non blocking client server with httplistener

ClientConsole

using System;
using System.Net;
using System.Threading;
using System.Threading.Tasks;

namespace ClientConsole
{
	static class Program
	{

		static void Main()
		{
			//Wait for serer to start
			Thread.Sleep(1000);
			Parallel.For(0, 100, i =>
			                     	{
			                     		var webRequest = WebRequest.Create("http://localhost:7896/");
			                     		webRequest.Headers["thread"] = i.ToString();
			                     		using (var webResponse = webRequest.GetResponse())
			                     		{
			                     			Console.WriteLine(webResponse.Headers["thread"]);
			                     		}
			                     	}
				);
			Console.ReadLine();

		}

	}
}

ServerConsole

using System;
using System.Diagnostics;
using System.Net;
using System.Threading;

namespace ServerConsole
{
	static class Program
	{
		static HttpListener listener;

		static void Main()
		{
			listener = new HttpListener();
			listener.Prefixes.Add("http://localhost:7896/");
			listener.AuthenticationSchemes = AuthenticationSchemes.Anonymous;

			listener.Start();
			while (true)
			{
				ProcessRequest();
			}

		}

		static void ProcessRequest()
		{
			var result = listener.BeginGetContext(ListenerCallback, listener);
			var startNew = Stopwatch.StartNew();
			result.AsyncWaitHandle.WaitOne();
			startNew.Stop();
			Console.WriteLine("ElapsedMilliseconds "+ startNew.ElapsedMilliseconds);
		}

		static void ListenerCallback(IAsyncResult result)
		{
			Thread.Sleep(1000);
			var context = listener.EndGetContext(result);

			context.Response.StatusCode = 200;
			context.Response.StatusDescription = "OK";
			var s = context.Request.Headers["thread"] + " Received";
			Console.WriteLine(s);
			context.Response.Headers["thread"] = s;
			context.Response.Close();

		}

	}
}