Howdy, your syntax is just a little off:
my $html < io->http("http://hgdownload.soe.ucsc.edu/database:80");
Note that the "io" is in lowercase, not upper as in your example. You also need the "->http" method, and "http://" prefix in your url.
Also, you'll have to ensure that you have the IO::All::LWP module installed.
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