sync-serve doesn't detect ipv6 addresses

[tamo]

Thanks for the great product!
I'd like to report a minor issue I just faced.

I need to listen on an ipv6 address.
asyncio version can simply serve("::", port)
but sync version needs specifying the family like

with serve(handler, "::", port, family=socket.AddressFamily.AF_INET6) as server:
  server.serve_forever()

[aaugustin]

While I care about consistency between the asyncio and threading implementation, I care about consistency with Python's stdlib even more, and this behavior is inherited from the standard library.

>>> import socket
>>> socket.create_server(("::", 1234))
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    s = socket.create_server(("::", 1234))
  File "/Users/myk/.pyenv/versions/3.13.1/lib/python3.13/socket.py", line 947, in create_server
    raise error(err.errno, msg) from None
OSError: [Errno 8] nodename nor servname provided, or not known (while attempting to bind on address ('::', 1234))
>>> socket.create_server(("::", 1234), family=socket.AddressFamily.AF_INET6)
<socket.socket fd=5, family=30, type=1, proto=0, laddr=('::', 1234, 0, 0)>

This should be improved in Python, perhaps by changing the default to family=AF_UNSPEC like asyncio.create_server and making it work. I recommend that you file an issue against Python.

[aaugustin]

Thank you for reporting this issue anyway!

[tamo]

Fair enough. Thanks!