def download(self, url, path):
        """Download url and save data to path."""
        # original_url = url
#        print(url)
        qurl = QUrl(url)
        url = to_text_string(qurl.toEncoded(), encoding='utf-8')

        logger.debug(str((url, path)))
        if url in self._workers:
            while not self._workers[url].finished:
                return self._workers[url]

        worker = DownloadWorker(url, path)

        # Check download folder exists
        folder = os.path.dirname(os.path.abspath(path))
        if not os.path.isdir(folder):
            os.makedirs(folder)

        request = QNetworkRequest(qurl)
        self._head_requests[url] = request
        self._paths[url] = path
        self._workers[url] = worker
        self._manager.head(request)
        self._timer.start()

        return worker
Download url and save data to path.