Man pages matching name plack::handler::http::server::simple in section 3pm:

Plack::Handler::HTTP::Server::Simple.3pm.en	debian 10 / libhttp-server-simple-psgi-perl
Plack::Handler::HTTP::Server::Simple.3pm.en	debian 11 / libhttp-server-simple-psgi-perl
Plack::Handler::HTTP::Server::Simple.3pm.en	debian 12 / libhttp-server-simple-psgi-perl