建议：下载时刷新缓存

[happyli0826]

        with open(file_path, 'wb') as fh:
            for chunk in resp.iter_content(chunk_size=1024):
                fh.write(chunk)
                fh.flush()  # add  增加刷新缓存立即写入硬盘，大量下载时内存占用过高