retries - `urllib3` fallback import from vendored version in `requests` is not correct

[briantist]

SUMMARY

In implementing retries, we need urllib3.util.Retry. We first try to import a standalone version of urllib3, which is usually available.

We have a fallback in case that fails to try to import via the requests library, which has a vendored version of urllib3 as well:

from requests.packages.urllib3.util import Retry

However this is not the correct form; instead we must import urllib3 as a module:

from requests.packages import urllib3

And then use it from there.

See: https://docs.python-requests.org/en/master/community/updates/#id25

No bug reports or issues in the wild have yet come up as a result of this, to my knowledge.

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• Bug Report

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