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Please run down the following list and make sure you've tried the usual "quick fixes":

• Search the issues already opened: https://github.com/googleapis/google-auth-library-python/issues

If you are still having issues, please be sure to include as much information as possible:

Environment details

• OS:
• Python version: 3.7
• pip version:
• google-auth version: 2.6.3

Steps to reproduce

1. python Google app Engine standard environment, have google-auth in requirements.txt.
2. Occurs when an instance is terminated.

"Traceback (most recent call last):
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/google/auth/transport/requests.py", line 154, in del
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/requests/sessions.py", line 737, in close
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/requests/adapters.py", line 326, in close
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/urllib3/poolmanager.py", line 223, in clear
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/urllib3/_collections.py", line 100, in clear
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/urllib3/poolmanager.py", line 174, in
File "/layers/google.python.pip/pip/lib/python3.7/site-packages/urllib3/connectionpool.py", line 498, in close
TypeError: catching classes that do not inherit from BaseException is not allowed"

Unable to figure out if the error is in urllib3 or google-auth, was working fine with version 2.6.2