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/h                   = Scheme (http in this case)
/plkr                = Format (Output format)
/3                   = Fetch limit
/www.plkr.org/rss.pl = Feed url

my $string      = '/h/plkr/3/www.plkr.org/rss.pl';

...
my @tokens      = split('/', $string);
my $compressed  =  compress($string) ; 
my $encoded     = encode_base64($compressed);