<?php

    $this->response->setStatusCode(200);
    $this->response->setHttpHeader('Last-Modified', date('r', filemtime($file)));
    $this->response->setHttpHeader('Etag', $etag);
    $this->response->setHttpHeader('Accept-Ranges', 'bytes');
    $this->response->setHttpHeader('Content-Type', 'application/octet-stream');
    $this->response->setHttpHeader('Content-Length', filesize($file));
    $this->response->setHttpHeader('Content-Disposition', 'attachment');
    $this->response->sendHttpHeaders();

    readfile($file);
    return sfView::NONE;