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function drupal_fast_404 in Drupal 7

Returns a simple 404 Not Found page.

If fast 404 pages are enabled, and this is a matching page then print a simple 404 page and exit.

This function is called from drupal_deliver_html_page() at the time when a a normal 404 page is generated, but it can also optionally be called directly from settings.php to prevent a Drupal bootstrap on these pages. See documentation in settings.php for the benefits and drawbacks of using this.

Paths to dynamically-generated content, such as image styles, should also be accounted for in this function.

1 call to drupal_fast_404()
drupal_deliver_html_page in includes/common.inc
Packages and sends the result of a page callback to the browser as HTML.

File

includes/bootstrap.inc, line 2912
Functions that need to be loaded on every Drupal request.

Code

function drupal_fast_404() {
  $exclude_paths = variable_get('404_fast_paths_exclude', FALSE);
  if ($exclude_paths && !preg_match($exclude_paths, $_GET['q'])) {
    $fast_paths = variable_get('404_fast_paths', FALSE);
    if ($fast_paths && preg_match($fast_paths, $_GET['q'])) {
      drupal_add_http_header('Status', '404 Not Found');
      $fast_404_html = variable_get('404_fast_html', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>');

      // Replace @path in the variable with the page path.
      print strtr($fast_404_html, array(
        '@path' => check_plain(request_uri()),
      ));
      exit;
    }
  }
}