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Fix Stale Content Behind a CDN: Cache-Control, ETag, Purging and Cache Busting

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Diagnosing stale content: checking Age, CF-Cache-Status and X-Cache headers, browser versus CDN versus origin caches, Cache-Control directives, immutable hashed assets, ETag revalidation, Vary pitfalls, purge by URL or tag, and service workers.

You deployed a change but users and agents still see the old page or file. Read cache headers, find which layer is serving stale content, set correct Cache-Control, hash filenames, and purge safely.

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#cdn#cache-control#http#etag#cloudflare

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