node.js download file has cjk name

file download throw error if you have file’s name composed CJK characters
encodeURIComponent

res.setHeader('Content-disposition', 'attachment; filename=' + encodeURIComponent(filename));
res.setHeader('Content-type', mimetype);
var filestream = fs.createReadStream(realPath);
filestream.pipe(res);

res.setHeader('Content-disposition', 'attachment; filename=' + encodeURIComponent(filename));

res.setHeader('Content-type', mimetype);

var filestream = fs.createReadStream(realPath);

filestream.pipe(res);