#!/usr/bin/perl -Tw

use CGI;
use strict;

BEGIN {
    my $POST_MAX = 512 * 1024;

    my $content_length = defined $ENV{'CONTENT_LENGTH'} ? $ENV{'CONTENT_LENGTH'} : 0;
    if ( ($POST_MAX > 0) && ($content_length > $POST_MAX) ) {
        #   custom request entity too large error handling
    }
}