Nodejs multer-sftp文件上传问题

Question

此处的节点js代码

  var express = require('express');
    var multer = require('multer');
    var path = require('path');
    var sftpStorage = require('multer-sftp')
    var app = express();
    var port = 3000;

// specify the folder
app.use(express.static(path.join('/home/g457b5jxaq4m/public_html/shiva/upload/, 'uploads')));
// headers and content type
app.use(function (req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});

var storage = sftpStorage({
     sftp: {
    host: 'ip address',
    port: 22,
    username: 'username',
    password: 'password'
  },
  // destination
  destination: function (req, file, cb) {
    cb(null, './uploads/')
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname);
  }
});
var upload = multer({ storage: storage });

app.post("/upload", upload.array("uploads[]", 12), function (req, res) {
  console.log('files', req.files);
  res.send(req.files);
});

var server = app.listen(port, function () {
  console.log("Listening on port %s...", port);
});

角度代码：

export class NotfoundComponent implements OnInit {

  filesToUpload: Array<File> = [];

  upload() {
    const formData: any = new FormData();
    const files: Array<File> = this.filesToUpload;
    console.log(files);

    for(let i =0; i < files.length; i++){
        formData.append("uploads[]", files[i], files[i]['name']);
    }
    console.log('form data variable :   '+ formData.toString());
    this.http.post('http://localhost:3000/upload', formData)

        .subscribe(files => console.log('files', files))
}

fileChangeEvent(fileInput: any) {
    this.filesToUpload = <Array<File>>fileInput.target.files;

}
  constructor(private http: HttpClient) { }

  ngOnInit() {
  }

}

HMTL

<input id="cin" name="cin" type="file" (change)="fileChangeEvent($event)" placeholder="Upload a file..." multiple/>


<button type="button" class="btn btn-success btn-s" (click)="upload()">
    <i class="glyphicon glyphicon-open-file"></i>&nbsp;Upload
</button>

控制台问题

我正在尝试借助Nodejs在远程服务器中上传文件。 前端 Angular 5 后端 Node js 我可以在本地服务器上上传，但是当我尝试在远程FTP响应中上载时，似乎出现链接内部错误。无法加载以下本地服务器节点API