Aside from the LWP modules, the perl libwww package includes (everywhere I've seen, at least on unix) the very useful binary executables POST, GET, and HEAD, which can be used from the command line - maybe your friend was referring to the POST binary?
It does neat things:
machine# POST
Usage: POST [-options] <url>...
-m <method> use method for the request (default is 'POST')
-f make request even if POST believes method is illegal
-b <base> Use the specified URL as base
-t <timeout> Set timeout value
-i <time> Set the If-Modified-Since header on the request
-c <conttype> use this content-type for POST, PUT, CHECKIN
-a Use text mode for content I/O
-p <proxyurl> use this as a proxy
-P don't load proxy settings from environment
-H <header> send this HTTP header (you can specify several)
-u Display method and URL before any response
-U Display request headers (implies -u)
-s Display response status code
-S Display response status chain
-e Display response headers
-d Do not display content
-o <format> Process HTML content in various ways
-v Show program version
-h Print this message
-x Extra debugging output
