HttpListener动态生成下载文件地址代码

          HttpListener httpListener = new HttpListener();
            httpListener.Prefixes.Add("http://*:" + tcpIpServerPort + "/" + this.Key + "/");
            httpListener.Start();
            HttpListenerContext context = httpListener.GetContext();
            HttpListenerRequest request = context.Request;
            HttpListenerResponse response = context.Response;
            byte[] buffer = new byte[2048];
            

            System.IO.Stream output = response.OutputStream;

            response.ContentType = @"application/octet-stream";

            FileStream fileStream = this.FileStream;

            response.ContentLength64 = fileStream.Length;
            response.AddHeader("Expires","-1");
            response.StatusCode = (int)HttpStatusCode.OK;


            lock(fileStream)
            {
                fileStream.Position = 0;

                while(true)
                {
                    int bi1 = fileStream.Read(buffer, 0, buffer.Length);
                    if(bi1 <= 0)
                    {
                        break;