Prevent thumbnail caching.

Author: chusopr

core/src/plugins/editor.diaporama/class.ImagePreviewer.php

@@ -67,10 +67,10 @@ public function switchAction($action, $httpVars, $filesVars)
 
                 header("Content-Type: ".AJXP_Utils::getImageMimeType(basename($cId))."; name=\"".basename($cId)."\"");
                 header("Content-Length: ".strlen($data));
-                header('Cache-Control: public');
-                header("Pragma:");
+                header('Cache-Control: no-cache');
+                header("Pragma: no-cache");
                 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()-10000) . " GMT");
-                header("Expires: " . gmdate("D, d M Y H:i:s", time()+5*24*3600) . " GMT");
+                header("Expires: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
                 print($data);
 
             } else {
@@ -83,10 +83,10 @@ public function switchAction($action, $httpVars, $filesVars)
                 $filesize = $stat["size"];
                 header("Content-Type: ".AJXP_Utils::getImageMimeType(basename($file))."; name=\"".basename($file)."\"");
                 header("Content-Length: ".$filesize);
-                header('Cache-Control: public');
-                header("Pragma:");
+                header('Cache-Control: no-cache');
+                header("Pragma: no-cache");
                 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()-10000) . " GMT");
-                header("Expires: " . gmdate("D, d M Y H:i:s", time()+5*24*3600) . " GMT");
+                header("Expires: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
 
                 $class = $streamData["classname"];
                 $stream = fopen("php://output", "a");