Man pages matching name plack::middleware::cache in section 3pm:

Plack::Middleware::Cache.3pm.en	debian 10 / libplack-middleware-cache-perl
Plack::Middleware::Cache.3pm.en	debian 11 / libplack-middleware-cache-perl
Plack::Middleware::Cache.3pm.en	debian 12 / libplack-middleware-cache-perl