L~R mentions:

"If you absolutely want to have the errors go to the web browser, you could probably modify the BEGIN block to print the proper header and use STDOUT instead of a regular file. I haven't tested that though."

In the past (when I didn't have access to the error log file), I used the following to get errors to print to the browser. I can in no way claim credit for the snippet below, but humbly offer it in the spirit that what once helped me may help you.

#Put the following code at the top of the script, just below #!/usr/bi
+n/perl. 
#Run the program from your browser, and tell us 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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Hagbone