Index: sites/default/default.settings.php
===================================================================
RCS file: /cvs/drupal/drupal/sites/default/default.settings.php,v
retrieving revision 1.51
diff -u -p -r1.51 default.settings.php
--- sites/default/default.settings.php	11 Oct 2010 23:49:48 -0000	1.51
+++ sites/default/default.settings.php	24 Nov 2010 19:58:03 -0000
@@ -378,6 +378,16 @@ ini_set('session.cookie_lifetime', 20000
 # $conf['omit_vary_cookie'] = TRUE;
 
 /**
+ * When Drupal serves a cached page, it still invokes hook_boot
+ * and hook_exit in all modules by default. This letś modules alter the page
+ * even when it is cached, which is required for some modules to function properly.
+ * In order to support reverse proxy caches this option needs to be disabled,
+ * since no code can be executed in Drupal when reverse proxy is used for
+ * caching pages for anonymous users.
+ */
+ # $conf['page_cache_invoke_hooks'] = FALSE;
+ 
+/**
  * CSS/JS aggregated file gzip compression:
  *
  * By default, when CSS or JS aggregation and clean URLs are enabled Drupal will