def METHOD_NAME(filename, headers, rows, tz=None):
    """Send an XLSX file to the client.
    :param filename: The name of the CSV file
    :param headers: a list of cell captions
    :param rows: a list of dicts mapping captions to values
    :param tz: the timezone for the values that are datetime objects
    :return: a flask response containing the XLSX data
    """
    buf = generate_xlsx(headers, rows, tz=tz)
    return send_file(filename, buf, 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', inline=False)