文件下载设置二进制

extend/base/Qrcode.php

@@ -205,7 +205,7 @@ class Qrcode
         header('Expires: 0');
         header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
         header('Cache-Control: private',false);
-        header('Content-Type: application/force-download');
+        header('Content-Type: application/octet-stream;charset=utf-8');
         header('Content-Disposition: attachment; filename="'.$filename.'"');
         header('Content-Transfer-Encoding: binary');
         header('Connection: close');