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Improve Default Cache Plugin of Joomla 3.5

Trony
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01 Apr 2016 17:19 - 22 Aug 2026 00:01 #4227 by Trony

Improve Default Cache Plugin of Joomla 3.5 was created by Trony

Joomla 3.5 with Default Cache Plugin Enabled, change Header when the pages are Cached.

No Cached Pages: Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0

Cached Pages: Cache-Control: no-cache

You can check your Header with Redbot .

With this Hack, we force CMS to stay with the Default Header (Cached and No Cached Pages).

WARNING: It's a Joomla Hack Core. BACKUP ALWAYS AND FOREVER !!!

First Step
Open your index.php of your template and put this code at the top

Code:

<?php
jimport('joomla.environment.response');
JResponse::allowCache(true);
$time = time()- 1;
JResponse::setHeader('Last-Modified', gmdate('D, d M Y H:i:s', $time) . ' GMT', true);
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 );
?>

Second Step
Open web.php in libraries ► joomla ► application
and comment with // this part of the code:

Code:

// 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'));
}
}

Third Step
Open page.php in libraries ► cache ► controller
and at the end:

Code:

/**
* 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);
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 );
$etagFuso = md5($id);
JResponse::setHeader('ETag', 'W/"'.$etagFuso.'"', true );

}

}

Note:
I used $etagFuso because Joomla give URL instead number.
Weak eTag (W/) is for Compressed and Non-Compressed Gzip Pages.

Now check with Redbot the Header of your Joomla's page.

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