/**
* @return bool
*/
public function isXmlHttpRequest()
{
return $this->header->has('X_REQUESTED_WITH') ? 'xmlhttprequest' === strtolower($this->header->get('X_REQUESTED_WITH')) : false;
}
/**
* Returns true if the response includes headers that can be used to validate
* the response with the origin server using a conditional GET request.
*
* @return bool true if the response is validateable, false otherwise
*
* @api
*/
public function isValidateable()
{
return $this->header->has('Last-Modified') || $this->header->has('ETag');
}