The other day I got frustrated that I couldn’t find a code example of a simple .NET OWIN standalone (i.e. not using IIS) web server (i.e. not a REST server) for .NET. After some research and trial-and-horror I came up with the following:
using System;
using System.Diagnostics;
using System.Net;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using System.Web.Http.SelfHost;
namespace WebServer
{
class Program
{
static void Main(string[] args)
{
const string serviceBaseUri = "http://localhost:4578/";
var config = new HttpSelfHostConfiguration(serviceBaseUri);
using (var server = new HttpSelfHostServer(config, new MyMessageHandler()))
{
server.OpenAsync().Wait();
Console.WriteLine("Press Ctrl+C to quit.");
Console.ReadLine();
}
}
}
public class MyMessageHandler : HttpMessageHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
Debug.Print(request.ToString());
var res = new HttpResponseMessage(HttpStatusCode.OK) { Content = new StringContent("Hello, World!") };
var tsc = new TaskCompletionSource<HttpResponseMessage>();
tsc.SetResult(res); // Also sets the task state to "RanToCompletion"
return tsc.Task;
}
}
}
Enjoy!
Thoughts of a Goldfish by Daniel Brolund 