Do you mean this wouldn't be rendered? It is outputted sometimes, between either a 500 page or a software error message regarding failing to find a sub routine. 
<!doctype html>
  <html>
    <head>
      <title>$pageTitle</title>
    </head>
    <body></body>
  </html>

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In reply to Re^2: Why server error out with module by keen2learn
in thread Why server error out with module by keen2learn

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