Browser and Server Communication Problem - Server only receive One text?

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp, unity
Domain
networking

Research direction

Reproduce the report with the EchoTest client and IOWebSocket/Echo server code, comparing standalone Unity and Firefox HTML5 builds. Start by tracing the WebSocket connection and message loop; done means identifying why only the first message arrives and verifying the behavior after the correction.

Written by the indexing model from the issue text.

Description

I try to build the website and communicate with Server (not web server), by using unity3D.
The problem is that, when i run both code on unity3d (one is client, other one Server). Both can send/ receive test string very well.
[client side will send text:0,1,2,3,4,5,....][client side receive text:123,123]
[server side will send test:123,123. if server receive client side data][server side receive text:0,1,2,3,4,5,....]

But when i build the [website(client) code] to html5 by using unity3D and run on Firefox browser. The server only receive One text data.
[server side receive the text:0]
[client side no receive]

This is website(client) code:

public class EchoTest : MonoBehaviour {

// Use this for initialization
IEnumerator Start () {
    WebSocket w = new WebSocket(new Uri("ws://127.0.0.1:3000")); 
    yield return StartCoroutine(w.Connect());
    w.SendString("0");
    int i = 0;
    while (true)
	{
		string reply = w.RecvString();
		if (reply != null)
		{
			Debug.Log ("Received: "+reply);
			w.SendString(""+i++);
		}
		if (w.error != null)
		{
			Debug.LogError ("Error: "+w.error);
			break;
		}
		yield return 0;
	}
    w.Close();
}

}

This is Server code:

public class IOWebSocket : MonoBehaviour
{

private static int i = 0;
WebSocketServer server;

void Start()
{
    server = new WebSocketServer(3000);
    server.AddWebSocketService<Echo>("/");
    server.Start();     
}

void OnDestroy()
{
    server.Stop();
    server = null;
}

}
// Update is called once per frame
public class Echo : WebSocketBehavior
{
protected override void OnMessage(MessageEventArgs e)
{
Sessions.Broadcast("123");
Debug.Log(System.Text.Encoding.Default.GetString(e.RawData));
}
}

I need some help,plz

Dominant language
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