Is the JavaScript file not being stored in the cache?

As I work on optimizing my web application, I am facing a challenge with a javascript file size of approximately 450K even after compressing it. While I intend to redo the javascripting in due time, for now, I need to go live with what I have. Initially, I created multiple small javascript libraries to enhance functionality. To include these files, I use a php file that consolidates all the javascript files and then included this php file as shown below:

<script language="js/js.php"></script>

I had hoped that the file would be cached upon the initial load, but upon checking with firebug, I noticed that every time I refresh the page or return to it, the file is reloaded from the server. Is there something additional that needs to be done to ensure that the file is cached on the user's end, or do I have a misunderstanding of how caching works?

phpjavascriptcaching

Answer №1

To ensure caching of the file, PHP headers need to be set.

Place the following code at the beginning of js.php:

ob_start("ob_gzhandler");

$expires = 2678400; // 1 month in seconds
header("Pragma: public");
header("Cache-Control: maxage=".$expires);
header('Expires: ' . gmdate('D, d M Y H:i:s', time()+$expires) . ' GMT');

This will enable basic caching and apply gzip compression on the content dynamically.

Answer №2

Have you considered leaving the .js file as is and allowing the web server to handle caching?
Compression may not be the priority here, but rather utilizing Conditional Get

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