Hi,

Could we add ConnectionError in list of retry so the client libraries which depend over api-core don't need to add.

"/layers/google.python.pip/pip/lib/python3.8/site-packages/google/cloud/bigquery/client.py", line 561, in create_table api_response = self._call_api( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/cloud/bigquery/client.py", line 574, in _call_api return call() File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/api_core/retry.py", line 281, in retry_wrapped_func return retry_target( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/api_core/retry.py", line 184, in retry_target return target() File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/cloud/_http.py", line 472, in api_request response = self._make_request( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/cloud/_http.py", line 336, in _make_request return self._do_request( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/cloud/_http.py", line 374, in _do_request return self.http.request( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/google/auth/transport/requests.py", line 464, in request response = super(AuthorizedSession, self).request( File "/layers/google.python.pip/pip/lib/python3.8/site-packages/requests/sessions.py", line 530, in request resp = self.send(prep, **send_kwargs) File "/layers/google.python.pip/pip/lib/python3.8/site-packages/requests/sessions.py", line 643, in send r = adapter.send(request, **kwargs) File "/layers/google.python.pip/pip/lib/python3.8/site-packages/requests/adapters.py", line 498, in send raise ConnectionError(err, request=request) requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))

I have reached out to individually to storage,bigquery and auth sdk page to report about this issue and they have acknowledged it googleapis/google-auth-library-python#739, googleapis/google-auth-library-python#737, googleapis/python-storage#414