Prove the cache behavior, not just the header.
wcdscan is a focused Web Cache Deception scanner. It compares authenticated and anonymous responses, repeats requests to confirm shared-cache behavior, and stores evidence without dumping sensitive response bodies.
$ wcdscan --authorized --url /account baseline auth 200 f64bb92d0e2a anon 302 9ae81ad7b11c variant /account/wcd-lab.css cache HIT age 13 match true result HIGH / SUSPICIOUS evidence confirmed