I could have sworn I knew how this worked, but apparently I was wrong. I am uploading a file via CGI.pm, and I wish to test if the file exists or if a garbage filename was entered

Here are two scripts that demonstrate the problem. The first just creates a filefield, the second is supposed to test if a real file was entered. If I use a POST method for the form, no error-checking is performed. If I use a GET method, however, the error-checking is activated.

Any idea why this is happening, and how to determine when to GET and when to POST?

part1.cgi

use CGI qw/:standard/;
use strict;

my $cgi = new CGI;

print     $cgi->header(),
    $cgi->start_html(),
    $cgi->start_multipart_form({
            -method    => 'GET',
            -action    => 'part2.cgi'
            }),
    $cgi->filefield({
            -name    => 'filename',
            }),
    $cgi->submit('Add'),
    $cgi->end_form(),
    $cgi->end_html();
[download]

part2.cgi

use CGI qw/:standard/;
use strict;

my $cgi = new CGI;

print     $cgi->header(),
    $cgi->start_html();

if (!upload('filename')) {
    print "We Die";
    }
else {
    print "No Die";
    }
[download]

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