docs: def _on_dynamodb_exception(self, error):
          """Dynamically handle DynamoDB exceptions, returning HTTP error
          responses.
  
          :param exceptions.DynamoDBException error:
  
          """
          if isinstance(error, exceptions.ConditionalCheckFailedException):
              raise web.HTTPError(409, reason='Condition Check Failure')
          elif isinstance(error, exceptions.NoCredentialsError):
              if _no_creds_should_return_429():
                  raise web.HTTPError(429, reason='Instance Credentials Failure')
          elif isinstance(error, (exceptions.ThroughputExceeded,
                                  exceptions.ThrottlingException)):
              raise web.HTTPError(429, reason='Too Many Requests')
          if hasattr(self, 'logger'):
              self.logger.error('DynamoDB Error: %s', error)
          raise web.HTTPError(500, reason=str(error))