That "LOOP:" gave me the willies, so I wondered what it would look like tidied up:

use warnings;
use strict;
use Data::Dumper;

my $urlbase = 'http://proxy/cgi-bin/getobj.pl?';

sub recurse
{
        my ($basedir, $dir) = @_;

        $dir = $basedir unless (defined($dir));
        $dir = "$dir/" unless ($dir =~ m#/$#);

        my $base = substr($dir, length($basedir));
        my %tree;

        opendir(DIR , $dir);
        foreach my $path (readdir(DIR))
        {
                next if ($path =~ /^\.\.?/);    # . & ..
                my $dirpath = "$dir$path";

                if (-f $dirpath)
                {
                        $tree{$path} = "$urlbase$base$path";
                }
                elsif (-d $dirpath && !-l $dirpath)
                {
                        $tree{$path} = recurse($basedir, $dirpath);
                }
        }
        closedir(DIR);

        return \%tree;
}

my ($path)  = @ARGV;

unless (defined($path))
{
        print "Usage: $0 path\n";
        exit(0);
}

print Dumper recurse ($path);
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