Last Updated: November 21, 2025
Focus Areas
| Focus |
|---|
Cache assets at multiple layers (browser, CDN, edge)
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Invalidate stale data with surrogate keys
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Commands & Queries
curl -I https://cdn.example.com --header 'Surrogate-Key: asset'
Check cache headers
fastly purge key asset
Purge CDN cache
cloudflare cache purge --url https://...
Invalidate edge cache
Summary
Balance freshness with performance by combining TTLs and purges.
💡 Pro Tip:
Use cache-control headers, surrogate keys, and stale-while-revalidate.