func getUserData(_ token: String, onCompletion: @escaping completionHandler) {
        //var sessionConfig = URLSessionConfiguration.default
        //sessionConfig.httpAdditionalHeaders = ["Authorization":"Bearer \(token)"]

        let request = NSMutableURLRequest(url: URL(string: RestAPIHandler.rootURL + "/all")!)
        request.httpMethod = "GET"
        request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")

        request.httpShouldHandleCookies = true

        //let session = URLSession(configuration: sessionConfig, delegate: self, delegateQueue: OperationQueue.main)
        let session = URLSession.shared
        let task = session.dataTask(with: request as URLRequest) { (data, response, error) in
            if let error = error { onCompletion(nil, error) }

            if let response = response as? HTTPURLResponse {
                switch response.statusCode {
                case 200:
                    if let data = data {
                        let json = JSON(data: data)
                        self.parseJSON(data: data)
                        onCompletion(json, nil)
                    } else {
                        onCompletion(nil, nil)
                    }
                case 401:
                    if let data = data {
                        let json = JSON(data: data)
                        onCompletion(json, nil)
                    } else {
                        onCompletion(nil, nil)
                    }
                default:
                    onCompletion(nil, nil)
                }
            }
        }
        task.resume()
    }