Embedio: HttpListener=Microsoft crashes on Linux NET Core 3.1 in EmbedIO 3.4.3

[NoTimeForHero]

Hello.

EmbedIO.WebServer with _HttpListenerMode=Microsoft_ crushes on Linux after any HTTP request with exception:

System.ObjectDisposedException: 
        Cannot access a disposed object.
        Object name: 'System.Net.HttpListenerResponse'.

But in Windows it working as intended.
With _HttpListenerMode=EmbedIO_ in Linux it works too.

Affected enviroment

• EmbedIO 3.4.3
• NET Core: 3.0/3.1
• Operating systems: Debian 9, CentOS 7
• Any port/prefix

Steps to reproduce
Minimal example:

using EmbedIO;
using EmbedIO.Actions;
using System;

namespace Test1
{
    class Program
    {
        static void Main(string[] args)
        {
            new WebServer(o => o.WithUrlPrefix("http://localhost:3000").WithMode(HttpListenerMode.Microsoft))
                .WithModule(new ActionModule("/", HttpVerbs.Any, ctx => ctx.SendDataAsync(new { Message = "Hello world!" })))
                .Start();
            Console.ReadKey();
        }
    }
}

Exception details from console

01:07:00.246 ERR >> [WebServer] [Vde65z5I60uOVpmTH7e+3Q] Fatal exception.
    $type           : System.ObjectDisposedException
    Message         : 
        Cannot access a disposed object.
        Object name: 'System.Net.HttpListenerResponse'.
    ObjectName      : System.Net.HttpListenerResponse
    TargetSite      : Void CheckDisposed()
    StackTrace      : 
        at System.Net.HttpListenerResponse.CheckDisposed()
        at System.Net.HttpListenerResponse.get_OutputStream()
        at EmbedIO.Net.Internal.SystemHttpResponse.get_OutputStream()
        at EmbedIO.WebServerBase`1.DoHandleContextAsync(IHttpContextImpl context)
    Source          : System.Net.HttpListener
    HResult         : -2146232798

[rdeago]

Hello @NoTimeForHero, thanks for using EmbedIO!

Thank you also for the gazillionth reason why ditching HttpListener would make EmbedIO a better library.

Unfortunately, digging into .NET Core's runtime source code to try and debug this issue would not only cost hours of time, not to mention headache medication^(*) — it would be pointless, since HttpListener has long been deemed obsolete and unworthy of any serious maintenance.

All the advice I can give is to steer away from the configuration that is giving you trouble: use HttpListenerMode.EmbedIO.

---

(*) no overstatement here: been there, done that — more than once.

[CraziiTim]

Hi. I'm having the same issue while using HttpListernerMode.EmbedIO
My full error log (incase curious) https://pastebin.com/5D0m4v7g

I've updated it to HttpListenerMode.Microsoft for testing purposes, seeing if this resolves the issue for me. Prior to this I was using mode EmbedIO

private static WebServer CreateWebServer(string u)
        {
            var server = new WebServer(o => o
                    .WithUrlPrefix(u)
                    .WithMode(HttpListenerMode.Microsoft))
                .WithCors()
                // First, we will configure our web server by adding Modules.
                .WithLocalSessionManager()
                .WithWebApi("/api", m => m.RegisterController(() => new ApiController()));


            // Listen for state changes.
            server.StateChanged += (s, e) => Logging.Log($"WebServer New State - {e.NewState}");

            return server;
        }

[CraziiTim]

Update: HttpListenerMode.Microsoft is even worse. Doesn't work at all lol. Back to HttpListenerMode.EmbedIO - Still the same issue Cannot access a disposed object.

My ApiManager.cs:

public ApiManager(string url)
        {
            this.url = url;
        }

        public void startServer()
        {
            Thread t = new Thread(() =>
            {
                Logging.Log("Starting web api server..");
                using (var server = CreateWebServer(url))
                {
                    server.RunAsync();
                    Logging.Log("Started web api server.");
                    Thread.Sleep(-1);
                }

            });
            t.Start();
            this.serverThread = t;
        }

        private static WebServer CreateWebServer(string u)
        {
            var server = new WebServer(o => o
                    .WithUrlPrefix(u)
                    .WithMode(HttpListenerMode.Microsoft))
                .WithCors()
                // First, we will configure our web server by adding Modules.
                .WithLocalSessionManager()
                .WithWebApi("/api", m => m.RegisterController(() => new ApiController()));


            // Listen for state changes.
            server.StateChanged += (s, e) => Logging.Log($"WebServer New State - {e.NewState}");

            return server;
        }

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.