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Perl & LWP by Sean M. Burke (Paperback, 2002)

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Written by a contributor to LWP, and with a foreword by one of LWP's creators,Perl & LWP is the authoritative guide to this powerful and popular toolkit. Perl & Lwp: Fetching Web Pages, Parsing Html, Writing Spiders & More.

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This volume on Perl and LWP covers topics including: understanding LWP and its design; fetching and analyzing URLs; extracting information from HTML using regular expressions and tokens; working with the structure of HTML documents using trees; setting and inspecting HTTP headers and response codes; managing cookies; accessing information that requires authentication; extracting links; cooperating with proxy caches; and writing Web spiders (also known as robots) in a safe fashion. It also includes many step-by-step examples that show how to apply the various techniques. Programs to extract information from Websites such as BBC News, Altavista, ABEBooks.com, and the Weather Underground, are explained in detail. The guide shows how to make Web requests, submit forms, and even provide authentication information, and it demonstrates using regular expressions, tokens, and trees to parse HTML.