code: func (e *Error) Error() string {
  	if e.AzureError.Code != "" {
  		return fmt.Sprintf("azure.%s: status %d, code: %s", e.Op, e.Code, e.AzureError.Code)
  	}
  	return fmt.Sprintf("azure.%s: status %d", e.Op, e.Code)
  }
docs: // Error returns a formatted error message