User:Scsbot/httpget
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httpget is a tool for low-level HTTP fetching; it is basically a command-line callable interface to the HTTP protocol. (It is similar to cURL, wget, and lynx -dump -source.)
httpget has two features which are important for this application: (1) it can post data, and (2) it can maintain cookies across calls (just as a real web browser would maintain cookies across page fetches during a session).
Documentation: http://www.eskimo.com/~scs/src/httpget.man.html
Source code download: ftp://ftp.eskimo.com/u/s/scs/src/httpget.tar.gz