cakephp download hanging in browser

I am trying to download a file thats already uploaded in cakephp app folder. I am using the function below in my controller but it just opens a blank page without even downloading the file

public function download($id = null) {
        $this->viewClass = 'Media';
        // Download app/outside_webroot_dir/example.pdf
    $adminProcedure = $this->AdminProcedure->findById($id);
    $filename = $adminProcedure['AdminProcedure']['filename'];
        $this->request->params = array(
            'id' => $adminProcedure['AdminProcedure']['id'],
            'name' => substr($filename, 0, strrpos($filename, '.')),
            'extension' => substr(strrchr($filename, '.'), 1),
            'ext'=>'pdf',
            'download' => true,
            'path' => APP.'admin_procedures'.DS,
        );
        $this->set($params);
    }
   
   
In my view i have used this bit of code to link to the file im trying to download.

?php echo $this->Html->link(__('Download', true), array('action' => 'download', $adminProcedure['AdminProcedure']['id'])); ?>

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