CakePHP: Redirect not workin - cakephp

Question

I have the following code in my controller:
class ContactsController extends AppController {
public $helpers = array('Html', 'Form', 'Session');
public $components = array('Session');
public function index() {
$this->set('contacts', $this->Contact->find('all'));
}
public function view($id) {
if (!$id) {
throw new NotFoundException(__('Invalid contact'));
}
$contact = $this->Contact->findById($id);
if (!$contact) {
throw new NotFoundException(__('Invalid contact'));
}
$this->set('contact', $contact);
}
public function add() {
if ($this->request->is('post')) {
$this->Contact->create();
if ($this->Contact->save($this->request->data)) {
$this->Session->setFlash('Your contact has been saved.');
$this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash('Unable to add your contact.');
}
}
}
}
In the add() method I have the line $this->redirect(array('action' => 'index')); I'm expecting this line to redirect back to my index page within my view. But all I get is a blank white page.
Any help appreciated.
Regards,
Stephen

Answer 1

Your code looks valid; I don't see an error in the code you provided.
There are a few possible causes;
there is an error somewhere else in your code, but cake php doesn't output the error message because debugging is disabled. Enable debugging by setting debugging to 1 or 2 inside app/Config/core.php - Configure::write('debug', 2);
you application is outputting something to the browser before the redirect header was sent. This may be caused by (non visible) white-space before or after any <?php or ?> . This will cause a 'headers already sent' warning, and the browser will not redirect. There are many questions regarding this situation here on StackOverflow, for example: How to fix "Headers already sent" error in PHP
Note;
in CakePHP its good practice to put a return before any redirect statement; this will allow better Unit-testing of your application, i.e.:
return $this->redirect(array('action' => 'index'));
update; additional 'pointers' on locating the cause
Tracking these kind of problems may be troublesome, I'll add some pointers
If you're using the Auth or Security component, it's possible that one of these cause the 'problem' (e.g. authorization failed or the posted data is marked 'invalid', which will be handled by a 'blackHole()' callback. Disable both in your AppController to check if the problem is still present
If the problem is still present, it is possible that headers are being sent (as mentioned before), but no warning/error is presented. To find if and where those headers are sent, add this code to your 'add' action;
Debugging code:
if (headers_sent($file, $line)) {
exit("headers were already sent in file: {$file}, line number: {$line}");
}

Answer 2

After lots of research finally I got a solution for that.
Please use
ob_start(); in AppController.php
ob_start();
class AppController extends Controller {
function beforeFilter() {
parent::beforeFilter();
}
}