google-api-python-client: KeyError: 'path' intermittent error

We’ve been facing an intermittent error when trying to use oauth2 services. It was working fine until we deployed a new version on GAE. Notice that we haven’t changed anything related to this code or the google libraries versions.

That’s the exception:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "./route/auth.py", line 37, in google_auth_callback
    user = service.userinfo().get().execute()
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 1121, in methodResource
    schema=schema)
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 1026, in __init__
    self._set_service_methods()
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 1061, in _set_service_methods
    self._add_basic_methods(self._resourceDesc, self._rootDesc, self._schema)
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 1091, in _add_basic_methods
    methodName, methodDesc, rootDesc, schema)
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 712, in createMethod
    maxSize, mediaPathUrl) = _fix_up_method_description(methodDesc, rootDesc, schema)
  File "/usr/local/lib/python2.7/site-packages/googleapiclient/discovery.py", line 580, in _fix_up_method_description
    path_url = method_desc['path']
KeyError: 'path'

Environment details

• OS: Google App Engine Flexible, debian:stretch-slim docker image
• Python version: 2.7.15
• pip version: 19.0.3
• versions: google-api-core==1.6.0 google-api-python-client==1.7.7 google-auth==1.6.1 google-auth-httplib2==0.0.3

Steps to reproduce

That’s the code, the error raises from service.userinfo().get().execute() . The error is intermittent and I haven’t figured out an specific scenario.

import httplib2
from googleapiclient.discovery import build
from oauth2client.client import AccessTokenCredentials

credentials = AccessTokenCredentials(<SOME ACCESS TOKEN>,
                                         user_agent=str(request.user_agent))
http = httplib2.Http()
http = credentials.authorize(http)

service = build("oauth2", "v2", http=http, developerKey=<MY API KEY>)

user = service.userinfo().get().execute()