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Cache header checker

Fetches a URL's caching headers through the project proxy and explains Cache-Control, Expires, Age, ETag, Last-Modified, Vary and CDN cache status in plain language, judged against the asset type.

Press the button to fetch the headers
Nothing leaves this page until you do. The verdict is judged against the URL class you picked or the classifier found, because a long max-age is sensible for a hashed asset and a stale-content risk for an HTML page.

The headers shown are what one GET from this project's proxy received at check time. Caches differ: a CDN in front of the origin may answer with different directives than the origin itself, and your own browser may have an older copy already stored. The verdicts are reading aids, not a substitute for testing real cache behavior with your own tools.
Options

More network tools

- HTTP timing probe (/network/http-timing)
- HTTP status reference (/web/http-status)
All network tools (/network)

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Canonical HTML: https://nutter.tools/network/cache-control-checker
Markdown version: https://nutter.tools/network/cache-control-checker.md
Plain-text version: https://nutter.tools/network/cache-control-checker.txt
Agent index: https://nutter.tools/llms.txt