For HTTP specifically, I would recommend Web Client Programming with Perl, which is available through the O'Reilly Open Books Project. While it may seem a little dated,

• chapters 2 and 3 illustrate how HTTP really works at the request/response level,
• chapter 4 leads the reader through making the requests manually (creating a socket connection to the remote server and making the request), and
• chapter 5 introduces the LWP module.

Hope that helps.

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