I think folks get annoyed when someone asks a question that could have been answered by the most cursory investigation of perl docs, perl monks, or CPAN:

"Hey, is there anything in perl to help me write HTML pages?"

sort of questions.

As to the issue of wanting to avoid canned modules to learn the nitty gritty, the poster just needs to make it clear that s/he has already done the basic homework:

"I want to redirect a page, but I don't want to use the CGI.pm shortcuts... can someone explain how?"

sort of thing. Putting a hyperlink in the text (1) shows you've done some homework, and (2) makes it visually stand out and be noticed, so the whole crowd doesn't shout back "RFM!".