def get_metadata_url(illust_id: int) ->str:
    """Get illust Metadata URL from ``illust_id``.

    :param illust_id: Pixiv illust_id
    :type illust_id: :class:`int`
    :return: Pixiv Metadata URL
    :rtype: :class:`str`

    """
    return 'https://www.pixiv.net/ajax/illust/{}/ugoira_meta'.format(illust_id)
