code: def parse_reason(response, content):
      
      def first_error(data):
          errors = data['error']['errors']
          if len(errors) > 1:
              # we have more than one error. We should capture that?
              logging.info('Received {} errors'.format(len(errors)))
          return errors[0]
  
      try:
          json_data = json.loads(content)
          return first_error(json_data)['reason']
      except:
          return response.reason
docs: Google return a JSON document describing the error. We should parse this
      and extract the error reason. See
      https://developers.google.com/analytics/devguides/reporting/core/v3/coreErrors