Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.611.2.10
diff -u -p -r1.611.2.10 common.inc
--- includes/common.inc	12 Sep 2007 07:29:57 -0000	1.611.2.10
+++ includes/common.inc	10 Oct 2007 10:31:03 -0000
@@ -318,7 +318,7 @@ function drupal_goto($path = '', $query 
  * Generates a site off-line message
  */
 function drupal_site_offline() {
-  drupal_set_header('HTTP/1.1 503 Service unavailable');
+  drupal_set_header('HTTP/1.0 503 Service unavailable');
   drupal_set_title(t('Site off-line'));
   print theme('maintenance_page', filter_xss_admin(variable_get('site_offline_message',
     t('@site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('@site' => variable_get('site_name', 'Drupal'))))));
@@ -328,7 +328,7 @@ function drupal_site_offline() {
  * Generates a 404 error if the request can not be handled.
  */
 function drupal_not_found() {
-  drupal_set_header('HTTP/1.1 404 Not Found');
+  drupal_set_header('HTTP/1.0 404 Not Found');
 
   watchdog('page not found', check_plain($_GET['q']), WATCHDOG_WARNING);
 
@@ -358,7 +358,7 @@ function drupal_not_found() {
  * Generates a 403 error if the request is not allowed.
  */
 function drupal_access_denied() {
-  drupal_set_header('HTTP/1.1 403 Forbidden');
+  drupal_set_header('HTTP/1.0 403 Forbidden');
   watchdog('access denied', check_plain($_GET['q']), WATCHDOG_WARNING);
 
 // Keep old path for reference
Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.145.2.6
diff -u -p -r1.145.2.6 bootstrap.inc
--- includes/bootstrap.inc	26 Jul 2007 19:16:45 -0000	1.145.2.6
+++ includes/bootstrap.inc	10 Oct 2007 10:31:04 -0000
@@ -850,7 +850,7 @@ function _drupal_bootstrap($phase) {
     case DRUPAL_BOOTSTRAP_ACCESS:
       // Deny access to hosts which were banned - t() is not yet available.
       if (drupal_is_denied('host', $_SERVER['REMOTE_ADDR'])) {
-        header('HTTP/1.1 403 Forbidden');
+        header('HTTP/1.0 403 Forbidden');
         print 'Sorry, '. $_SERVER['REMOTE_ADDR']. ' has been banned.';
         exit();
       }