Index: bootstrap.inc
===================================================================
--- bootstrap.inc	(revision 848)
+++ bootstrap.inc	(working copy)
@@ -539,7 +539,7 @@
 function drupal_page_header() {
   header("Expires: Sun, 19 Nov 1978 05:00:00 GMT");
   header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
-  header("Cache-Control: store, no-cache, must-revalidate");
+  header("Cache-Control: no-store, no-cache, must-revalidate");
   header("Cache-Control: post-check=0, pre-check=0", FALSE);
 }