How do I force HTTP connections to use IPv4 instead of IPv6 in Python? - python-requests

Question

When attempting to connect to the Binance REST API from a Windows 11 computer, I got the following error:
ccxt.base.errors.ExchangeError: binanceus {"code":-71012,"msg":"IPv6 not supported"}
In this particular example I am using the ccxt Python library, but I assume the problem exists for any HTTP connection / library since the error comes from Binance. Here's sample code that replicates the issue on Windows 11 (works fine on a Linux machine):
import ccxt
exchange = ccxt.binanceus({'apiKey': '<your_key>', 'secret': '<your_secret>'})
print(exchange.fetch_balance())
I speculate that this is happening because by default in Windows 11 IPv6 has a higher priority than IPv4:
> netsh interface ipv6 show prefixpolicies
Querying active state...
Precedence Label Prefix
---------- ----- --------------------------------
50 0 ::1/128
40 1 ::/0
35 4 ::ffff:0:0/96
30 2 2002::/16
5 5 2001::/32
3 13 fc00::/7
1 11 fec0::/10
1 12 3ffe::/16
1 3 ::/96
I suppose one solution is to change this priority so IPv4 is used by default, but I don't want to do this, and I also prefer the code to work everywhere.
Under the hood, the ccxt library uses the Python requests library, and allows the user to construct a custom Session object.
I came up with the following hack/workaround which works for me
Is there a cleaner/better/more robust way to achieve the same thing?
import ccxt
import requests
from requests_toolbelt.adapters import source
import socket
def get_ipv4_session():
local_ipv4 = socket.gethostbyname(socket.gethostname())
src = source.SourceAddressAdapter(local_ipv4)
session = requests.Session()
session.mount("https://", src)
return session
exchange = ccxt.binanceus({
'apiKey': '<your key>',
'secret': '<your secret>',
'session': get_ipv4_session()
})
print(exchange.fetch_balance())
I read the answers here as well but they seem more complicated: Force requests to use IPv4 / IPv6