Resolved websocket-sharp runtime error after WebGL build

Hello.

I'm creating a system that uses websocket-sharp to communicate with a server.
It worked fine in the Unity editor but gave an error in the browser after the WebGL build.
Do you know how to solve it?
If my information is missing, please contact me.

Thank you.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using WebSocketSharp;
5.  
6. public class TestWS : MonoBehaviour
7. {
8.     private WebSocket ws;
9.  
10.     private void Start()
11.     {
12.         ws = new WebSocket("ws://xxx.xxx.xxx.xxx:xxxxx");
13.  
14.         ws.OnOpen += (sender, e) =>
15.         {
16.             Debug.Log("WebSocket connected");
17.             ws.Send("Hello server!");
18.         };
19.  
20.         ws.OnMessage += (sender, e) =>
21.         {
22.             Debug.Log("Received message: " + e.Data);
23.         };
24.  
25.         ws.OnClose += (sender, e) =>
26.         {
27.             Debug.Log("WebSocket closed");
28.         };
29.  
30.         ws.Connect();
31.     }
32.  
33.     private void OnDestroy()
34.     {
35.         if (ws != null && ws.IsAlive)
36.         {
37.             ws.Close();
38.         }
39.     }
40. }

error messages

websocket_build.loader.js:1

exception thrown: RuntimeError: null function or function signature mismatch,RuntimeError: null function or function signature mismatch

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[24860]:0x6ba9d2

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[24855]:0x6ba473

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[751]:0x36028

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[963]:0x3e9ff

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[18603]:0x524cae

    at invoke_viiii (http://localhost:61228/Build/websocket_build.framework.js.gz:3:343679)

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[2443]:0xa04c0

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[1257]:0x52609

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[18606]:0x524ce2

    at invoke_viii (http://localhost:61228/Build/websocket_build.framework.js.gz:3:343150)

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[11959]:0x3ed975

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[11937]:0x3eb341

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[24853]:0x6ba3f9

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[24326]:0x6adf7c

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[4518]:0x14b595

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[18609]:0x524d0a

    at invoke_iiii (http://localhost:61228/Build/websocket_build.framework.js.gz:3:343510)

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[924]:0x3c80c

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[8648]:0x280096

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[616]:0x262d3

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[2404]:0x9d088

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[22880]:0x64b3c6

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[21760]:0x5ee971

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[20761]:0x577e23

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[10980]:0x37cf4f

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[10980]:0x37cfbe

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[10064]:0x2f1e87

    at http://localhost:61228/Build/websocket_build.wasm.gz:wasm-function[18601]:0x524c8c

    at browserIterationFunc (http://localhost:61228/Build/websocket_build.framework.js.gz:3:212816)

    at callUserCallback (http://localhost:61228/Build/websocket_build.framework.js.gz:3:166141)

    at Object.runIter (http://localhost:61228/Build/websocket_build.framework.js.gz:3:167401)

    at Browser_mainLoop_runner (http://localhost:61228/Build/websocket_build.framework.js.gz:3:165676)



websocket_build.framework.js.gz:3

Uncaught RuntimeError: null function or function signature mismatch

    at websocket_build.wasm.gz:0x6ba9d2

    at websocket_build.wasm.gz:0x6ba473

    at websocket_build.wasm.gz:0x36028

    at websocket_build.wasm.gz:0x3e9ff

    at websocket_build.wasm.gz:0x524cae

    at invoke_viiii (websocket_build.framework.js.gz:3:343679)

    at websocket_build.wasm.gz:0xa04c0

    at websocket_build.wasm.gz:0x52609

    at websocket_build.wasm.gz:0x524ce2

    at invoke_viii (websocket_build.framework.js.gz:3:343150)

    at websocket_build.wasm.gz:0x3ed975

    at websocket_build.wasm.gz:0x3eb341

    at websocket_build.wasm.gz:0x6ba3f9

    at websocket_build.wasm.gz:0x6adf7c

    at websocket_build.wasm.gz:0x14b595

    at websocket_build.wasm.gz:0x524d0a

    at invoke_iiii (websocket_build.framework.js.gz:3:343510)

    at websocket_build.wasm.gz:0x3c80c

    at websocket_build.wasm.gz:0x280096

    at websocket_build.wasm.gz:0x262d3

    at websocket_build.wasm.gz:0x9d088

    at websocket_build.wasm.gz:0x64b3c6

    at websocket_build.wasm.gz:0x5ee971

    at websocket_build.wasm.gz:0x577e23

    at websocket_build.wasm.gz:0x37cf4f

    at websocket_build.wasm.gz:0x37cfbe

    at websocket_build.wasm.gz:0x2f1e87

    at websocket_build.wasm.gz:0x524c8c

    at browserIterationFunc (websocket_build.framework.js.gz:3:212816)

    at callUserCallback (websocket_build.framework.js.gz:3:166141)

    at Object.runIter (websocket_build.framework.js.gz:3:167401)

    at Browser_mainLoop_runner (websocket_build.framework.js.gz:3:165676)



websocket_build.framework.js.gz:3

An abnormal situation has occurred: the PlayerLoop internal function has been called recursively. Please contact Customer Support with a sample project so that we can reproduce the problem and troubleshoot it.

 

Make sure you run a development build with all debugging features turned on, such as exception handling and full stacktraces.The given error message is not helpful so you need to get more info from the build.

 

Thank you.
I will try.

 

I checked "Development Build" in "Build Settings".
I checked "Full" in "Project Settings" > "Stack Trace".
But the error did not change.
Am I missing a setting?
My Unity editor version is "2021.3.11f1".

 

Does it Solved

 

WebSocket-sharp does not export (in a working condition) to WebGL.
You need a JS library to integrate the browser WebSocket API for Unity.