SimpleServer.cs

using System.IO;


// modified from RestSharp unit tests https://github.com/restsharp/RestSharp/blob/master/RestSharp.IntegrationTests/Helpers/SimpleServer.cs
namespace UnitTesting
{
	using System;
	using System.Net;
	using System.Security;
	using System.Threading;

	/// <summary>
	/// Simple echo handler
	/// </summary>
	/// <remarks>via https://github.com/restsharp/RestSharp/blob/master/RestSharp.IntegrationTests/Helpers/SimpleServer.cs </remarks>
	public class SimpleServer : IDisposable
	{
		private readonly HttpListener listener;
		private readonly Action<HttpListenerContext> handler;
		private Thread thread;

		private SimpleServer(HttpListener listener, Action<HttpListenerContext> handler)
		{
			this.listener = listener;
			this.handler = handler;
		}

		/// <summary>
		/// Simple echo handler
		/// <example>Usage: <code>
		/// using (SimpleServer.Create(SimpleServer.ECHO_URL)) { /* make an http post to same url, get back what you sent */ }
		/// </code></example>
		/// </summary>
		/// <remarks>via https://github.com/restsharp/RestSharp/blob/master/RestSharp.IntegrationTests/Helpers/SimpleServer.cs </remarks>
		/// <param name="url"></param>
		/// <param name="authenticationSchemes"></param>
		/// <returns></returns>
		public static SimpleServer Create(
			string url,
			AuthenticationSchemes authenticationSchemes = AuthenticationSchemes.Anonymous)
		{
			return Create(url, context => EchoHandler(context), authenticationSchemes);
		}

		/// <summary>
		/// Simple echo handler
		/// <example>Usage: <code>
		/// using (SimpleServer.Create(SimpleServer.ECHO_URL, SimpleServer.QueryStringBasedContentAndContentTypeHandler)) { /* make an http post to same url, get back what you sent */ }
		/// </code></example>
		/// </summary>
		/// <remarks>via https://github.com/restsharp/RestSharp/blob/master/RestSharp.IntegrationTests/Helpers/SimpleServer.cs </remarks>
		/// <param name="url"></param>
		/// <param name="handler"></param>
		/// <param name="authenticationSchemes"></param>
		/// <returns></returns>
		public static SimpleServer Create(
			string url,
			Action<HttpListenerContext> handler,
			AuthenticationSchemes authenticationSchemes = AuthenticationSchemes.Anonymous)
		{
			var listener = new HttpListener { Prefixes = { url }, AuthenticationSchemes = authenticationSchemes };
			var server = new SimpleServer(listener, handler);

			server.Start();
			return server;
		}

		public void Start()
		{
			if (this.listener.IsListening)
			{
				return;
			}

			this.listener.Start();

			this.thread = new Thread(() => {
				var context = this.listener.GetContext();
				if(this.handler != null) this.handler(context);
				context.Response.Close();
			}) { Name = "WebServer" };

			this.thread.Start();
		}

		public void Dispose()
		{
			try
			{
				this.thread.Abort();
			}
			catch (ThreadStateException threadStateException)
			{
				Console.WriteLine("Issue aborting thread - {0}.", threadStateException.Message);
			}
			catch (SecurityException securityException)
			{
				Console.WriteLine("Issue aborting thread - {0}.", securityException.Message);
			}

			if (this.listener.IsListening)
			{
				try
				{
					this.listener.Stop();
				}
				catch (ObjectDisposedException objectDisposedException)
				{
					Console.WriteLine("Issue stopping listener - {0}", objectDisposedException.Message);
				}
			}

			this.listener.Close();
		}

		/// <summary>
		/// Handler helper that takes the content type, content from the querystring ("ct" and "c", respectively)
		/// </summary>
		/// <param name="obj"></param>
		public static void QueryStringBasedContentAndContentTypeHandler(HttpListenerContext obj)
		{
			QueryStringBasedContentAndContentTypeHandler(obj, "ct", "c", 200);
		}

		/// <summary>
		/// Handler helper that takes the content type/content from the querystring
		/// </summary>
		/// <param name="obj"></param>
		/// <param name="paramContentType"></param>
		/// <param name="paramContent"></param>
		/// <param name="statusCode"></param>
		public static void QueryStringBasedContentAndContentTypeHandler(HttpListenerContext obj, string paramContentType, string paramContent, int statusCode)
		{
			var contentType = obj.Request.QueryString[paramContentType];
			if( ! string.IsNullOrWhiteSpace(contentType) ) obj.Response.ContentType = contentType;

			var content = obj.Request.QueryString[paramContent];
			if(null != content)
			using(var sw = new StreamWriter(obj.Response.OutputStream))
				sw.Write(content);

			obj.Response.StatusCode = statusCode;
		}

		/// <summary>
		/// Handler helper that just dumps what was sent
		/// </summary>
		/// <param name="obj"></param>
		/// <param name="statusCode"></param>
		/// <param name="contentIsNthAcceptType">Which accept type should be used as the content type?</param>
		public static void EchoHandler(HttpListenerContext obj, int statusCode = 200, int contentIsNthAcceptType = 0)
		{
			obj.Response.ContentType = obj.Request.AcceptTypes == null || obj.Request.AcceptTypes.Length == 0 ? obj.Request.ContentType : obj.Request.AcceptTypes[contentIsNthAcceptType];

			string content = null;
			using (var sr = new StreamReader(obj.Request.InputStream)) content = sr.ReadToEnd();
			
			if (null != content)
				using (var sw = new StreamWriter(obj.Response.OutputStream))
					sw.Write(content);

			obj.Response.StatusCode = statusCode;
		}

		/// <summary>
		/// Can use to return what you sent, for testing.
		/// </summary>
		public const string ECHO_URL = "http://localhost:8080/";

		/// <summary>
		/// Returns what you sent, for testing.  If Fiddler is enabled, this will be an echo service.
		/// </summary>
		public const string FIDDLER_ECHO_URL = "http://localhost:8888/";


	}
}

similar - https://github.com/bcantoni/echotest