Send a file header in controller (file download)

To return a downloadable file in a controller action, you have to send a file header in controller like that:

$fileName = 'mm_actioncodes_export_'.date("Ymd_His").'.csv';
$fp = fopen(Mage::getBaseDir('var') . DS .'export' . DS . $fileName, 'w');
fputcsv($fp, $codes, ';', '"');
$this->_prepareDownloadResponse($fileName, array(
    'type'  => 'filename',
    'value' => Mage::getBaseDir('var') . DS .'export' . DS . $fileName,
    //'rm'    => true // can delete file after use
return $this;


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