CDN Cache Busting Strategies: Ensuring Users See New Content Immediately

Introduction

Your team just shipped a critical CSS fix at 2 AM. The bug was embarrassing — a broken checkout button on mobile. You deploy, verify on staging, and push to production. But for the next six hours, your support queue fills with the same complaint: “The button is still broken.” Your CDN cached the old file. Every edge node in 40 countries is serving the broken version. The fix exists on your origin servers, but the world doesn’t know it yet.

This is the cache busting problem — and it’s one of the most operationally painful gaps between “deployed” and “live.”