* Connects to a websocket server.
 * @param  {string} url     The url of the WS Server
 * @param  {string} channel The channel to subscribe
 * @return {boolean} connection status
 */
public connect(url: string, channel: string): boolean {
    console.group('WebSocketService: Welcome to the connect function.');
    console.log('Connects to', url);
    console.log('Channel is', channel);
    let _self = this;
    let socket = new SockJS(url);

_self.wsClient = Stomp.over(socket);

    _self.wsClient.connect({}, function(frame) {
        _self.setConnected(true);
        console.log('Connected: ', frame);
        _self.wsClient.subscribe(channel, function(greeting) {
            console.log(greeting);
            _self.subjects[channel].next(greeting);
        });
    });
    console.groupEnd();
    return true;
}

private test2(){
  let username : string = 'admin';
  let password : string = 'pass';
  let headers = new Headers();
  headers.append("Authorization", "Basic " + btoa(username + ":" + password));
  headers.append("Content-Type", "application/x-www-form-urlencoded");
  console.log('Test beginnt');
  return this._http.get('http://localhost:8080/gs-guide-websocket', {headers: headers}).map(res=> console.log(res))
}