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my $loop=8;
my $pm = Parallel::ForkManager->new($loop);
...
};
print "got session data: ".Dumper(\%session)."\n";

# ...
# extract cgi args from query string
...
$session->{"$now:$count"} = $count;
warn "got session ".Dumper($session);

now what is in the session for [8f13e7d0f1d140f6a1100510c1f82f6a]?
got session data: $VAR1 = {
...
          'previous_uri' => '/cgi-bin/session.pl'
        };