http.py 文件源码

def is_valid_url(url):
    """
    Tests a URL to ensure it doesn't appear to be a blacklisted IP range.
    """
    parsed = urlparse(url)
    if not parsed.hostname:
        return False

    server_hostname = get_server_hostname()

    if parsed.hostname == server_hostname:
        return True

    try:
        ip_address = socket.gethostbyname(parsed.hostname)
    except socket.gaierror:
        return False

    if ip_address == server_hostname:
        return True

    ip_network = IPNetwork(ip_address)
    for addr in DISALLOWED_IPS:
        if ip_network in addr:
            return False

    return True