Man pages matching name test::http::server::simple::stashwarnings in section 3pm:

Test::HTTP::Server::Simple::StashWarnings.3pm.en	debian 10 / libtest-http-server-simple-stashwarnings-perl
Test::HTTP::Server::Simple::StashWarnings.3pm.en	debian 11 / libtest-http-server-simple-stashwarnings-perl
Test::HTTP::Server::Simple::StashWarnings.3pm.en	debian 12 / libtest-http-server-simple-stashwarnings-perl