Cache-Control best practice?

Static assets (JS/CSS/images with hash): Cache-Control: public, max-age=31536000, immutable. HTML: no-cache + ETag. API: private, no-cache.

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Cache Header Inspector

Audit Cache-Control + ETag strategy

Paste HTTP response headers

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Learn more — how it works, FAQ & guide

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Calculate percentages, increases, decreases & more

Calculate exact age in years, months, days, hours

Body Mass Index — metric and imperial

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.