Javascript IncomingForm可以在不设置标题的情况下很快上传图片

我如何使用

在Nodejs上上传文件，而不是这么快设置标题

router.post('/upload/pictures', function (req, res, next) {

var temp_path =  '';
var temp_token =  '';
var new_location = '';
var file_name = '';
var sessionKey = '';


var form = new formidable.IncomingForm(),
    files = [],
    fields = [];

form.parse(req, function(err, fields, files) {
    res.writeHead(200, {'content-type': 'image/jpeg'});
    res.write('received upload:\n\n');
    res.end(util.inspect({fields: fields, files: files}));
});

？？？？res.end（util.inspect（{fields:fields，files:files}））

我检查会话并在此处设置标题。。然后得到一个错误

if（！result）返回res.status（401）.send（{message:'Session expired'}）

错误：发送邮件后无法设置邮件头。 位于ServerResponse.OutgoingMessage.setHeader（http.js:690:11）

另外，我如何摆脱它创建的所有临时文件

  vagrant@vagrant-ubuntu-trusty-64:/tmp$ ls
     upload_1a6db52f44333bcc0c186d326f130187 
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7

谢谢 菲尔

  vagrant@vagrant-ubuntu-trusty-64:/tmp$ ls
     upload_1a6db52f44333bcc0c186d326f130187 
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7
     upload_77e40c1d9a779cd78e3dd99f67e041c7