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  1. or download this
    sub check_url {

...
    # If the HTTP_REFERER was invalid, send back an error.            
+       #
    if ($check_referer != 1) { &error('bad_referer') }
}
  2. or download this
        local($check_referer) = 0;
    my $refhost = $ENV{'HTTP_REFERER'};
...

    # If the HTTP_REFERER was invalid, send back an error.            
+       #
    if ($check_referer != 1) { &error('bad_referer') }