Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.333
diff -u -p -r1.333 bootstrap.inc
--- includes/bootstrap.inc	7 Dec 2009 07:25:24 -0000	1.333
+++ includes/bootstrap.inc	8 Dec 2009 07:14:15 -0000
@@ -1034,7 +1034,7 @@ function drupal_page_header() {
   $default_headers = array(
     'Expires' => 'Sun, 19 Nov 1978 05:00:00 GMT',
     'Last-Modified' => gmdate(DATE_RFC1123, REQUEST_TIME),
-    'Cache-Control' => 'no-cache, must-revalidate, post-check=0, pre-check=0',
+    'Cache-Control' => 'private, must-revalidate, post-check=0, pre-check=0',
     'ETag' => '"' . REQUEST_TIME . '"',
   );
   drupal_send_headers($default_headers);