public function isCacheable()
{
if (!in_array($this->statusCode, array(200, 203, 300, 301, 302, 404, 410))) {
return false;
}
if ($this->headers->hasCacheControlDirective('no-store') || $this->headers->getCacheControlDirective('private')) {
return false;
}
return $this->isValidateable() || $this->isFresh();
}