sockjs client implementation for unity3D using xhr polling (so this works with unity free license). just import https://github.com/Extrawurst/sockjs-unity3d-xhr (for example as a submodule) and see the usage example below or the example unity project in this repo.

================== Usage

For a more complex example see the chat server/client in nodejs and unity in the source code. See the https://github.com/sockjs/sockjs-node sockjs documentation for details on the server implementation.

Simple usage example:

public class Client : MonoBehaviour {

	public SockjsClient sockjs = new SockjsClient();
	
	public void Start()
	{
		sockjs.OnMessage += OnMessage;
		sockjs.OnConnect += OnConnect;
		
		// connect to wherever your server is running
		sockjs.Connect("http://localhost:9999/echo/");
	}

	private void OnMessage(string _msg)
	{
		// got message
		Debug.Log(_msg);
	}

	private void OnConnect()
	{
		Debug.Log("connected");
		
		sockjs.SendData("hello world");
	}
}