1 files changed, 5 insertions, 6 deletions
diff --git a/core/Visualization/Chart.php b/core/Visualization/Chart.php
index c795522d8d..9efd164aa9 100644
--- a/core/Visualization/Chart.php
+++ b/core/Visualization/Chart.php
@@ -10,6 +10,9 @@
  * @package Piwik
  */
 
+// no direct access
+defined('PIWIK_INCLUDE_PATH') or die;
+
 /**
  * @see libs/open-flash-chart/php-ofc-library/open-flash-chart.php
  * @link http://teethgrinder.co.uk/open-flash-chart-2/
@@ -125,12 +128,8 @@ abstract class Piwik_Visualization_Chart implements Piwik_iView
 	
 	public function render()
 	{
-		if(Piwik_Url::getCurrentScheme() == 'https' ||
-			Zend_Registry::get('config')->General->reverse_proxy)
-		{
-			@header("Pragma: ");
-			@header("Cache-Control: must-revalidate");
-		}
+		@header("Pragma: ");
+		@header("Cache-Control: no-store, must-revalidate");
 		return $this->chart->toPrettyString();
 	}