WWW can not get response on WegGL player mode

i made a webgl project. and i use HttpListerner(c#) as my server and use port 8081.
code like this:

Code (CSharp):

1.  sSocket = ar.AsyncState as HttpListener;
2.                 HttpListenerContext context = sSocket.EndGetContext(ar);
3.                 sSocket.BeginGetContext(new AsyncCallback(GetContextCallBack), sSocket);
4.                 HttpListenerRequest request = context.Request;
5.                 HttpListenerResponse response = context.Response;
6.                 Stream strem = request.InputStream;
7.                 StreamReader reader = new StreamReader(strem, Encoding.UTF8);
8.  
9.                 string info = reader.ReadToEnd();
10.                 info = System.Web.HttpUtility.UrlDecode(info);
11.                 reader.Close();
12.                 strem.Close();
13.  
14.                 string res = procCls.onProcInfo(info);
15.  
16.                 byte[] buffer = Encoding.UTF8.GetBytes(res);
17.                 response.ContentLength64 = buffer.Length;
18.                 Stream output = response.OutputStream;
19.                 output.Write(buffer, 0, buffer.Length);
20.                 output.Close();
21.                 response.Close();

the function are save document data and so on. when i play in editor mode, it run ok. i can send message to server and get the response.send message like this:

Code (CSharp):

1. IEnumerator IEUpload(string _url)
2.     {
3.         byte[] myData = System.Text.Encoding.UTF8.GetBytes("This is some test data");
4.         UnityWebRequest www = UnityWebRequest.Put(_url, myData);
5.         yield return www.Send();
6.  
7.         if (!string.IsNullOrEmpty(www.error))
8.         {
9.             appendCtrlDebugTx("fail to request..." + www.error);
10.             debugTx = "fail to request..." + www.error;
11.             Debug.Log(www.error);
12.         }
13.         else
14.         {
15.             appendCtrlDebugTx(www.downloadHandler.text);
16.             debugTx = www.downloadHandler.text;
17.             Debug.Log("Upload complete!");
18.         }
19.     }

but when i release project to a webgl and put it on a tomcate. i can only sent message to server but can not get response from server. and the error is unknown error.
my tomcat port is 8080 my http server port is 8081. i make sure correct address and port. but i can not get response. how to do?
thank you!

 

up.
Same problem..

Code (CSharp):

1. void Start ()
2.     {
3.         listener = new HttpListener ();
4.         listener.Prefixes.Add ("http://localhost:4444/");
5.         listener.Prefixes.Add ("http://127.0.0.1:4444/");
6.         listener.AuthenticationSchemes = AuthenticationSchemes.Anonymous;
7.         listener.Start ();
8.  
9.         listenerThread = new Thread (startListener);
10.         listenerThread.Start ();
11.         Debug.Log ("Server Started");
12.     }
13.  
14.     private void startListener ()
15.     {
16.         while (true) {            
17.             var result = listener.BeginGetContext (ListenerCallback, listener);
18.             result.AsyncWaitHandle.WaitOne ();
19.         }
20.     }

..lead to:

Code (JavaScript):

1. SocketException: Success
2.   at System.Net.Sockets.Socket..ctor (System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) [0x00000] in <00000000000000000000000000000000>:0

Unity 2019.3.14f
WebGL Release build.