Simple WS ASP.NET Core

websockets.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;

namespace SimpleWebSockets
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                    .UseKestrel()
                    .UseUrls("http://+:80")
                    .Configure(app =>
                    {
                        app.UseWebSockets();
                        app.Run(async context =>
                        {
                            // Only support websocket requests
                            if (!context.WebSockets.IsWebSocketRequest)
                            {
                                context.Response.StatusCode = 400;
                                return;
                            }

                            using (var webSocket = await context.WebSockets.AcceptWebSocketAsync())
                            {
                                // Do WebSocket things
                            }
                        });
                    })
                    .Build();

            host.Run();
        }
    }
}