def parse_host(host):
    """
    """
    if re.match(r'^(\d+)$', host) is not None:
        return ("0.0.0.0", int(host))
    if re.match(r'^(\w+)://', host) is None:
        host = "//" + host
    o = parse.urlparse(host)
    hostname = o.hostname or "0.0.0.0"
    port = o.port or 0
    return (hostname, port)