Cache Busting & Versioning

Have you ever updated your website or app, only to find users are still seeing the old version?

This common issue is often due to caching. Cache busting is a technique used to force browsers and caching servers (like CDNs) to load the latest version of your files, rather than serving stale, cached copies.

Caches are fantastic for performance, but they can hold onto old content.

When a browser or CDN caches a file (like an image, CSS, or JavaScript), it usually does so based on the file's URL and specific HTTP headers (like Cache-Control). If the URL never changes, the cache might never realize the file's content has been updated.