Just a FWIW ... here's something I've used when trying to get the browser to display error messages in situations where my access to tools is limited. I grabbed this from a list/group years ago, and don't pretend to be able to explain the finer points of what makes it tick....

#Put the following code at the top of the script, just below #!/usr/bi
+n/perl. 
#Run the program from your browser, and read what is printed there.

BEGIN {
        local($|) = 1;                  # Temporarily turn off bufferi
+ng
        print "Content-type: text/plain\n\n";
        my $date = localtime;
        print "Script $0\nrunning on $date (Perl version $])\n\n";
        unless (open STDERR, ">&STDOUT") {
                print "Can't redirect STDERR: $!";
                exit;
        }
        print "\n";
}
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