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-rw-r--r--program/include/rcube_shared.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/include/rcube_shared.inc b/program/include/rcube_shared.inc
index 4119f1287..2cf59af5f 100644
--- a/program/include/rcube_shared.inc
+++ b/program/include/rcube_shared.inc
@@ -93,7 +93,7 @@ function send_modified_header($mdate, $etag=null, $skip_check=false)
else
header("Last-Modified: ".gmdate("D, d M Y H:i:s", $mdate)." GMT");
- header("Cache-Control: max-age=0");
+ header("Cache-Control: private, must-revalidate, max-age=0");
header("Expires: ");
header("Pragma: ");