I'd add Network Programming with Perl by Lincoln Stein. Somewhat more specific, and many of the libraries used are dated. But it did provide you with a huge am

I'd add Network Programming with Perl by Lincoln Stein. Somewhat more specific, and many of the libraries used are dated. But it did provide you with a huge amount of information, from writing simple echo clients with raw sockets up to fully multi process HTTP deamons, in a very accessible way.