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Two part question here.

What is the proper way in a module to determine if a page request is resulting in a HTTP 200 OK? Looking through static $stored_headers for a 30x/40x/50x seems wrong.

What is the earliest hook that you can reliably do this from?

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When I was developing the code for Nodewords, I used the following code, to verify if Drupal was serving an error page:

  $headers = drupal_get_headers();

  if (preg_match('@HTTP/1\.[01]\x20+403@', $headers)) {
    return array('type' => NODEWORDS_TYPE_ERRORPAGE, 'id' => 403);
  }

  if (preg_match('@HTTP/1\.[01]\x20+404@', $headers)) {
    return array('type' => NODEWORDS_TYPE_ERRORPAGE, 'id' => 404);
  }

The function containing that code is called from nodewords_preprocess_page(), the implementation of hook_preprocess_page().

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  • Thanks. This is essentially what I am doing. It just doesn't seem "right".
    – mpdonadio ♦
    Commented Aug 30, 2011 at 22:51
  • It's the only way I know of, as the path is not changed, when Drupal returns an error page. Suppose the user try to access example.com/404, when that page doesn't exist; Drupal shows the error page, but the URL the user would see is still the same.
    – avpaderno ♦
    Commented Aug 30, 2011 at 23:01

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