Speed Up Joomla 3.5 with Cache Plugin and 304 Not Modified Header | Forum | FusoElektronique

<?php
jimport('joomla.environment.response');
JResponse::allowCache(true);
$time = time()- 1;
$etagFuso = md5($_SERVER['REQUEST_URI']);
JResponse::setHeader('ETag', 'W/"'.$etagFuso.'"', true );
JResponse::setHeader('Last-Modified', gmdate('D, d M Y H:i:s', $time) . ' GMT', true);

$user =& JFactory::getUser();
if ($user->get('guest') == 1) {
JResponse::setHeader('Expires', gmdate('D, d M Y H:i:s', time()+ 900) . ' GMT');
JResponse::setHeader('Cache-Control', 'private,s-maxage=900,max-age=900,must-revalidate', false );
} else {
JResponse::setHeader('Expires', 'Wed, 17 Aug 2005 00:00:00 GMT', true);
JResponse::setHeader('Cache-Control', 'no-store,no-cache,must-revalidate,post-check=0,pre-check=0,max-age=0', false );
}

JResponse::setHeader('Pragma', 'no-cache', true );
?>

// If the response is set to uncachable, we need to set some appropriate headers so browsers don't cache the response.
		if (!$this->response->cachable)
		{
			// Expires in the past.
			//$this->setHeader('Expires', 'Wed, 17 Aug 2005 00:00:00 GMT', true);

			// Always modified.
			// $this->setHeader('Last-Modified', gmdate('D, d M Y H:i:s') . ' GMT', true);
			// $this->setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0', false);

			// HTTP 1.0
			$this->setHeader('Pragma', 'no-cache');
		}
		else
		{
			// Expires.
			// $this->setHeader('Expires', gmdate('D, d M Y H:i:s', time() + 900) . ' GMT');

			// Last modified.
			if ($this->modifiedDate instanceof JDate)
			{
				$this->setHeader('Last-Modified', $this->modifiedDate->format('D, d M Y H:i:s'));
			}
		}

/**
	 * Set the ETag header in the response
	 *
	 * @param   string  $etag  The entity tag (etag) to set
	 *
	 * @return  void
	 *
	 * @since   11.1
	 */
	protected function _setEtag($etag)
	{
		jimport('joomla.environment.response');
                JResponse::allowCache(true);
		$etagFuso = md5($id);

                $last_modified = filemtime($_SERVER['REQUEST_URI']);
                if(!headers_sent() && isset($_SERVER["HTTP_IF_MODIFIED_SINCE"]) || !headers_sent() && isset($_SERVER['HTTP_IF_NONE_MATCH']))
                {
                if(strtotime($_SERVER["HTTP_IF_MODIFIED_SINCE"]) >= $last_modified || stripslashes($_SERVER['HTTP_IF_NONE_MATCH']))
                {
                header('HTTP/1.x 304 Not Modified', true);
		header('ETag: '. 'W/"'.$etagFuso.'"', true );
	        header('Expires: '. gmdate('D, d M Y H:i:s', time()+ 900) . ' GMT');
	        header('Cache-Control: private,s-maxage=900,max-age=900,must-revalidate', false );
	        header('Last-Modified: '. gmdate("D, d M Y H:i:s", $last_modified) . ' GMT');
	        header('Pragma: no-cache', false );
                exit();
                }               
                }
	}
}