Event

http://cpansearch.perl.org/src/MLEHMANN/AnyEvent-HTTP-1.44/HTTP.pm

http://cpansearch.perl.org/src/MLEHMANN/AnyEvent-HTTP-1.44/HTTP.pm A Perl module that uses AnyEvent “framework” to do HTTP/1.0 requests in a parallel, non-blocking fashion

[]rus] Почти-web-сервер своими руками / Великий Язык PERL! / Хабрахабр

http://habrahabr.ru/blogs/perl/69411/#habracut some examples on how to write simple http server in Perl