Pip install should retry for 502 http error code

[kasium]

What's the problem this feature will solve?

When a HTTP error occurs during install, pip retries when the error is 500, 503, 520, 527 (see

pip/src/pip/_internal/network/session.py

Lines 350 to 360 in 4b14e7c

	retries = urllib3.Retry(
	# Set the total number of retries that a particular request can
	# have.
	total=retries,
	# A 503 error from PyPI typically means that the Fastly -> Origin
	# connection got interrupted in some way. A 503 error in general
	# is typically considered a transient error so we'll go ahead and
	# retry it.
	# A 500 may indicate transient error in Amazon S3
	# A 520 or 527 - may indicate transient error in CloudFlare
	status_forcelist=[500, 503, 520, 527],

). In my case a private pypi answers with 502 from time to time and a try would be great

Describe the solution you'd like

Pip should retry when a 502 error occurs

Alternative Solutions

As an alternative, pip could maintain a opinionated list of retry codes but allow users to overwrite/add new ones so that it fits their needs.

Additional context

n/a

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[kasium]

Any update to far or opinion. I'm happy to give a PR a try...