Use \OC_Response for cache invalidation

core/avatar/controller.php

@@ -28,11 +28,8 @@ class OC_Core_Avatar_Controller {
 		$avatar = new \OC_Avatar();
 		$image = $avatar->get($user, $size);
 
-		header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
-		header('Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT');
-		header('Cache-Control: no-store, no-cache, must-revalidate');
-		header('Cache-Control: post-check=0, pre-check=0', false);
-		header('Pragma: no-cache');
+		\OC_Response::disableCaching();
+		\OC_Response::setLastModifiedHeader(gmdate( 'D, d M Y H:i:s' ).' GMT');
 		if ($image instanceof \OC_Image) {
 			$image->show();
 		} elseif ($image === false) {
@@ -111,11 +108,8 @@ class OC_Core_Avatar_Controller {
 		}
 
 		$image = new \OC_Image($tmpavatar);
-		header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
-		header('Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT');
-		header('Cache-Control: no-store, no-cache, must-revalidate');
-		header('Cache-Control: post-check=0, pre-check=0', false);
-		header('Pragma: no-cache');
+		\OC_Response::disableCaching();
+		\OC_Response::setLastModifiedHeader(gmdate( 'D, d M Y H:i:s' ).' GMT');
 		$image->show();
 	}