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-rw-r--r--lib/action.php1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/action.php b/lib/action.php
index 8056cb9ec..d9b5afa99 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -879,6 +879,7 @@ class Action extends HTMLOutputter // lawsuit
*/
function handle($argarray=null)
{
+ header('Vary: Accept-Encoding,Cookie');
$lm = $this->lastModified();
$etag = $this->etag();
if ($etag) {