In order to mark a response as not modified, you need to set at least
the Last-Modified etag response header before calling this method. Otherwise
a comparison will not be possible.
| public checkNotModified ( Cake\Network\Request $request ) : boolean | ||
| $request | Cake\Network\Request | Request object |
| return | boolean | Whether the response was marked as not modified or not. |
/**
* Checks if the response can be considered different according to the request
* headers, and the caching response headers. If it was not modified, then the
* render process is skipped. And the client will get a blank response with a
* "304 Not Modified" header.
*
* - If Router::extensions() is enabled, the layout and template type are
* switched based on the parsed extension or Accept-Type header. For example,
* if `controller/action.xml` is requested, the view path becomes
* `app/View/Controller/xml/action.ctp`. Also if `controller/action` is
* requested with `Accept-Type: application/xml` in the headers the view
* path will become `app/View/Controller/xml/action.ctp`. Layout and template
* types will only switch to mime-types recognized by Cake\Network\Response.
* If you need to declare additional mime-types, you can do so using
* Cake\Network\Response::type() in your controller's beforeFilter() method.
* - If a helper with the same name as the extension exists, it is added to
* the controller.
* - If the extension is of a type that RequestHandler understands, it will
* set that Content-type in the response header.
*
* @param Event $event The Controller.beforeRender event.
* @return bool false if the render process should be aborted
*/
public function beforeRender(Event $event)
{
$isRecognized = !in_array($this->ext, ['html', 'htm']) && $this->response->getMimeType($this->ext);
if (!empty($this->ext) && $isRecognized) {
$this->renderAs($event->subject(), $this->ext);
} elseif (empty($this->ext) || in_array($this->ext, ['html', 'htm'])) {
$this->respondAs('html', ['charset' => Configure::read('App.encoding')]);
}
if ($this->_config['checkHttpCache'] && $this->response->checkNotModified($this->request)) {
return false;
}
}
/**
* Checks if the response can be considered different according to the request
* headers, and the caching response headers. If it was not modified, then the
* render process is skipped. And the client will get a blank response with a
* "304 Not Modified" header.
*
* @param Event $event The Controller.beforeRender event.
* @return bool false if the render process should be aborted
*/
public function beforeRender(Event $event)
{
if ($this->_config['checkHttpCache'] && $this->response->checkNotModified($this->request)) {
return false;
}
}