title: Can´t get handshake to wss://echo.websocket.org/ with UnitySocketIO
body: <p>I do basic sample integrating UnitySocketIO https://github.com/NetEase/UnitySocketIO/ with unity but I get an error, someone tried to do?</p>
  
  <pre><code>using UnityEngine;
  using System.Collections;
  using SocketIOClient;
  using WebSocket4Net;
  
  public class WsConnection : MonoBehaviour {
  
      Client client;
      string url = "wss://echo.websocket.org";
  
      // Use this for initialization
      void Start () {
  
          client = new Client(url, WebSocketVersion.DraftHybi00);
          client.Opened += SocketOpened;
          client.Message += SocketMessage;
          client.SocketConnectionClosed += SocketConnectionClosed;
          client.Error +=SocketError;
  
          client.Connect();
  
      }
  
      private void SocketOpened(object sender, System.EventArgs e) {
          //invoke when socket opened
          client.Send("hello world");
      }
  
      private void SocketMessage (object sender, MessageEventArgs e) {
          if ( e!= null &amp;&amp; e.Message.Event == "message") {
              string msg = e.Message.MessageText;
              //process(msg);
              Debug.Log(msg);
  
              client.Close();
          }
      }
  
      private void SocketConnectionClosed(object sender, System.EventArgs e) {
          //invoke when socket opened
          Debug.Log("Conexion cerrada...");
      }
  
  
      private void SocketError(object sender, System.EventArgs e) {
          //invoke when socket opened
          Debug.Log(((SocketIOClient.ErrorEventArgs)e).Message);
      }
  
  }
  </code></pre>
  
  <p>ouput is:</p>
  
  <blockquote>
    <p>Error initializing handshake with wss://echo.websocket.org/</p>
  </blockquote>
  
  <p>I've tried with ws and wss protocol</p>