# File lib/aws/core/client.rb, line 342
      def expired_credentials? response
        response.error and
        response.error.respond_to?(:code) and
        (
          response.error.code.to_s.match(/expired/i) or # session credentials
          response.error.code == 'InvalidClientTokenId' or # query services
          response.error.code == 'UnrecognizedClientException' or # json services
          response.error.code == 'InvalidAccessKeyId' or # s3
          response.error.code == 'AuthFailure' # ec2
        )
      end