Man pages matching name plack::request::withencoding in section 3pm:

Plack::Request::WithEncoding.3pm.en	debian 10 / libplack-request-withencoding-perl
Plack::Request::WithEncoding.3pm.en	debian 11 / libplack-request-withencoding-perl
Plack::Request::WithEncoding.3pm.en	debian 12 / libplack-request-withencoding-perl