The cancel token takes no effect.

[雨落随风]

编辑器下多次运行 UniWebServer 后，Unity 有几率会展示端口不可重复使用的报错。

[tarukosu]

The port error didn't happen in my environment.
Could you explain the situation in which the error occurs?

[雨落随风]

目前没发现问题，但会持续关注的，如果再次发现再讨论吧，谢谢你的回复与关注~~
当然我也做了一些修改，你可以理解是一种无厘头的防御式编程**吧。

using System;
using System.Net;
using System.Threading;
using static HoloLab.UniWebServer.Loom;

namespace HoloLab.UniWebServer
{
    public class HttpServer
    {
        private HttpListener httpListener;
        private CancellationTokenSource tokenSource;
        public event Action<HttpListenerContext> OnRequest;

        public async void Start(int port)
        {
            httpListener = new HttpListener();
            var uri = $"http://*:{port}/";
            httpListener.Prefixes.Add(uri);
            tokenSource = new CancellationTokenSource();
            var token = tokenSource.Token;
            await ToOtherThread;
            httpListener.Start();
            UnityEngine.Debug.Log($"{nameof(HttpServer)}: Server Started, http://{GetLocalIPAddress()}:{port}");
            while (true)
            {
                try
                {
                    token.ThrowIfCancellationRequested();
                    var context = await httpListener.GetContextAsync();
                    OnRequest?.Invoke(context);
                }
                catch (Exception e)
                {
                    if (e is OperationCanceledException || e is ObjectDisposedException)
                    {
                        UnityEngine.Debug.Log($"{nameof(HttpServer)}: Server Stoped !");
                        break;
                    }
                }
            }
        }

        public void Stop()
        {
            tokenSource.Cancel();
            httpListener.Stop();
        }

        // 获取本机ip
        private string GetLocalIPAddress() 
        {
            var host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (var ip in host.AddressList)
            {
                if (ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                {
                    return ip.ToString();
                }
            }
            throw new Exception("No network adapters with an IPv4 address in the system!");
        }
    }
}

[雨落随风]

我可能发现问题了，在下载文件时，突然中断，如果下载逻辑没有及时 dispose掉，会有几率会导致 Server 端口占用的问题。
可能这个跟 Server 没太多关系，跟 Client 下载逻辑倒是有些关系。
我就头脑风暴一下，大胆说说了哈。