About
About CacheLens
Turns a response's caching headers into a clear answer: cached or not, by whom, for how long, and what's wrong.
It parses Cache-Control, Expires, Date, Age,
ETag, Last-Modified, Vary and Pragma and explains the browser
and shared-cache outcome per RFC 9111. Runs in your browser; nothing is sent anywhere. It is a
static read of the headers — real behavior also depends on method, status, and request headers.