Arduino Websocket Client

I used this code to connect Arduino MKR1000 with API(server) using a websocket via WiFi.

 #include <WiFi101.h>
  #include <WebSocketClient.h>

  const char* ssid     = "********";
  const char* password = "********";
  char path[] = "/";
  char host[] = "wss://echo.websocket.org";

  WebSocketClient webSocketClient;

  WiFiClient client;

  void setup() {
    Serial.begin(115200);
    delay(10);


    Serial.println();
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);

    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi connected");
    IPAddress ip = WiFi.localIP();
    Serial.print("IP Address: ");
    Serial.println(ip);

    delay(5000);


    // Connect to the websocket server
    if (client.connect("wss://echo.websocket.org", 443)) {
      Serial.println("Connected");
    } else {
      Serial.println("Connection failed.");
      while (1) {
        // Hang on failure
      }
    }

    // Handshake with the server
    webSocketClient.path = path;
    webSocketClient.host = host;
    if (webSocketClient.handshake(client)) {
      Serial.println("Handshake successful");
    } else {
      Serial.println("Handshake failed.");
      while (1) {
        // Hang on failure
      }
    }

  }


  void loop() {
    String data;

    if (client.connected()) {

      webSocketClient.getData(data);
      if (data.length() > 0) {
        Serial.print("Received data: ");
        Serial.println(data);
      }

      // capture the value of analog 9, send it along
      pinMode(9, INPUT);
      data = String(digitalRead(9));

      webSocketClient.sendData(data);

    } else {
      Serial.println("Client disconnected.");
      while (1) {
        // Hang on disconnect.
      }
    }

    // wait to fully let the client disconnect
    delay(3000);

  }

And It always gives me this output:

   WiFi connected
   IP Address: 192.168.2.149
   Connected
   Waiting...
   Waiting...
   Handshake failed.