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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 Trony

#4227

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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