返回目标文件可用的下载地址
        :param remote_path: 每一项代表需要下载的文件路径
        :type remote_path: str list

def download_url(self, remote_path, **kwargs):
        """返回目标文件可用的下载地址
        :param remote_path: 每一项代表需要下载的文件路径
        :type remote_path: str list
        """

        def get_url(dlink):
            return self.session.get(dlink,
                                    headers=BAIDUPAN_HEADERS,
                                    stream=True).url

        if not hasattr(self, 'dsign'):
            self.get_sign()

        if isinstance(remote_path, str) or isinstance(remote_path, str):
            remote_path = [remote_path]

        file_list = []
        jdata = json.loads(self.meta(remote_path).content)
        if jdata['errno'] != 0:
            jdata = self.__err_handler('generic', jdata['errno'],
                                       self.meta,
                                       args=(remote_path,)
                                       )
        logging.debug('[*]' + str(jdata))
        for i, entry in enumerate(jdata['info']):
            url = entry['dlink']
            foo = get_url(url)
            if 'wenxintishi' in foo:
                file_list.append(self._yunguanjia_format(remote_path[i]))
            else:
                file_list.append(get_url(entry['dlink']))

        return file_list