Cache-Control inspector

Explain a pasted HTTP response Cache-Control value, show freshness settings, and flag contradictory or suspicious directive combinations.

01 Input

YOUR INPUT

02 Output

LOCAL RESULT

QUICK GUIDE / 32

How to use

Select Load example to restore the sample, or replace the labeled inputs with your own values.
Review the options and select Run tool. No input is sent to a server.
max-age is a response freshness lifetime; s-maxage overrides it for shared caches. no-cache requires revalidation rather than forbidding storage.
Inspect the result, then copy or download it. Clear removes visible inputs and output.

A worked example

Load example restores these values.

Response Cache-Control value:
public, max-age=3600, s-maxage=600, stale-while-revalidate=30

Expected result

Browser freshness: 3600 seconds
Shared-cache freshness: 600 seconds

Scope & limitations

One response header value; quoted field-name lists are supported. Does not calculate current age, Expires, Vary, validator behavior or request-header rules. Unknown extension directives are preserved; this is not a complete HTTP cache simulator.

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Cache-Control inspector

01 Input

02 Output

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