code: public function validateResponse($url, $response)
  	{
  		if ($response->code != 200)
  		{
  			$error = htmlspecialchars($response->body);
  
  			throw new \DomainException($error, $response->code);
  		}
  	}
docs: Method to validate a response.
  
  @param   string    $url       The request URL.
  @param   Response  $response  The response to validate.
  
  @return  void
  
  @since   1.0
  @throws  \DomainException