<b>This week in caching: how many cache layers is too many</b>
Browser, CDN, edge, reverse proxy, object cache, query cache — the stack adds up:
— <i>Mapping your layers</i> — drawing the full request path so you know which layer served (or stranded) a response.
— <i>TTL alignment across layers</i> — the bug where a 1h CDN TTL outlives a 5m origin TTL and serves stale long after a purge.
— <i>Debugging a multi-layer stale</i> — a checklist for 'I purged and it's still old' across each tier.
— <i>When a layer is pure overhead</i> — spotting the proxy that adds latency and zero hit rate.
Credits: the AWS and Cloudflare layered-caching guides.
Bookmark: the TTL-alignment section — the silent cause of most 'why is it still cached' tickets.
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<b>This week in caching: how many cache layers is too many</b>
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