PerformanceAvailable

HTTP Cache and Compression Analyzer

Inspect Cache-Control, validators, Vary, Age, Content-Encoding and observed CDN or cache headers from one bounded public fetch.

Protected server-side checkNo permanent storage by default

Request scope

One bounded public HTTP response is fetched. Local, private and reserved networks are blocked.

About this check

What the tool checks

Read final-response cache semantics separately from transport compression and vendor-specific edge signals, with no opaque grade.

How this check works

The shared SSRF-protected HTTP client performs a bounded fetch and safely validates every redirect before reading final response headers.
Cache-Control directives, validators, freshness, variation and compression signals are reported independently.

What this check cannot establish on its own

One response cannot reveal every cache key, edge region, purge rule, browser state or origin/CDN configuration.
A missing vendor header does not prove that no CDN is used, and compression can vary by representation and request headers.

Data sources