pip and IPv6

[jenslink]

Description

Hi,

there is a small problem with IPv6 only environments with an IPv6 only resolver. You can
not install anything:

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f835a601090>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/pip/

I debugged this, and it all boils down to a CDN hosted by Fastly and the Fastly authoritative DNS Severs used do not have AAAA records. The solution is easy: Ask Fastly to change to different auth servers with AAAA records.

deb.debian.org (an also the OpenBSD CDN) had the same problem.

Temporary workaround: use a DNS dual-stacked DNS resolver.

Expected behavior

No response

pip version

all

Python version

all

OS

all

How to Reproduce

• Setup an IPv6 only VM
• configure a local resolver (or have another IPv6 only VM with an IPv6 only resolver
• install anything via pip

Output

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f835a601090>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/pip/

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[jeanas]

If the problem is in PyPI's CDN then it is not a problem in pip. Moved to the PyPI tracker as pypi/warehouse#15277