handlers.py 文件源码

def _support_hybrid_ipv6():
    """Return True if it is possible to use hybrid IPv6/IPv4 sockets
    on this platform.
    """
    # Note: IPPROTO_IPV6 constant is broken on Windows, see:
    # http://bugs.python.org/issue6926
    try:
        if not socket.has_ipv6:
            return False
        with contextlib.closing(socket.socket(socket.AF_INET6)) as sock:
            return not sock.getsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY)
    except (socket.error, AttributeError):
        return False