async def async_http_download(src_url, dest_file, chunk_size=65536):
    async with aiofiles.open(dest_file, 'wb') as fd:
        async with aiohttp.ClientSession() as session:
            async with session.get(src_url) as resp:
                async for chunk in resp.content.iter_chunked(chunk_size):
                    await fd.write(chunk)