How to send variable to the custom script and run without redirect

Controller {

Action {
...
$this->response->header('Location', 'http://domain/custom.php?url='.
$url);
$this->response->send();

// Problem is response redirecting before run below codes. /
...
if ($this->Book->save($this->request->data)) {
$this->Session->setFlash(__('The book has been
saved'));
$this->redirect(array('action' => 'index'));
...
}
}

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