What is the reason behind appending a timestamp to the URL of a JavaScript resource?

$script.ready('jui',function() { 
$script('<?php base_path(); ?>js/partnerScripts.js?ts=1315442861','partners');
}); 

Can anyone explain why there is a fixed ts=timestamp at the end of the partnerScripts.js file name? I checked the folder and found that file without the ts=xxxx. What significance does this number hold in the code? Is it a real timestamp or just a random fixed number?

Answer №1

The process of "cache busting" is often employed to ensure different versions are utilized.

If you desire users to indefinitely cache the script, while still maintaining the ability to easily update it in the future, simply modify the timestamp. This essentially creates a new URL/resource without needing to relocate your files.

Furthermore, the validity of the timestamp can be confirmed by visiting September 2011. It represents the number of seconds since midnight, UTC, January 1, 1970.

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