In addition to all the good things that have been said
about LWP, there are things that LWP gets right that
the sample code does not: authentication and proxies,
for instance (though I am not sure that LWP::Simple foots the bill completely)
As for checking wether you have LWP:
perl -MLWP -e 'print "Hello\n"'
You can't have everything: where would you put it?
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