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can not upload file in angular 2 when using ng-fullstack

See original GitHub issue

I use this library : https://github.com/valor-software/ng2-file-upload

but application console log bad request 400 .

and then I follow this tutorial

https://www.thepolyglotdeveloper.com/2016/02/upload-files-to-node-js-using-angular-2/

and It still console log bad request 400 .

Why ? I can’t use xhr to upload file ? or I can’t use ng2-file-upload to upload file to server .

This is my code now .

media.ts

import {
  Component,
  Inject,
  OnInit,
  ElementRef
} from '@angular/core';
import { Http, Response,HTTP_PROVIDERS, Headers,RequestOptions } from '@angular/http';
import { FormBuilder, ControlGroup, Control } from '@angular/common';
import { AuthService } from '../dashboard/services/auth-services';
import {CORE_DIRECTIVES, FORM_DIRECTIVES, NgClass, NgStyle} from '@angular/common';
import {FILE_UPLOAD_DIRECTIVES, FileUploader} from 'ng2-file-upload';
import { Media } from '../dashboard/interface/media';
import {MediaService} from "../dashboard/services/media-service";
import {Observable} from 'rxjs/Rx';

const URL = '/api/media';

@Component({
  selector: 'demo',
  templateUrl: 'client/dev/demo/demo.html',// indicate html page
  directives: [FILE_UPLOAD_DIRECTIVES, NgClass, NgStyle, CORE_DIRECTIVES, FORM_DIRECTIVES],
  providers:[
    HTTP_PROVIDERS,
    AuthService,
    MediaService]
})


export class DemoComponent implements OnInit{
  user:string;
  pathLocal:string="";
  filesWUpload:File;
  uploader:FileUploader = new FileUploader({url: URL});

  filesToUpload: Array<File>;

  constructor(private _elRef:ElementRef,private _authService: AuthService,private mediaService:MediaService ,private _http: Http ){
    this.filesToUpload = [];
  }



  upload() {
    this.makeFileRequest("/api/media", [], this.filesToUpload).then((result) => {
      console.log(result);
    }, (error) => {
      console.log(error);
    });
  }

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

  makeFileRequest(url: string, params: Array<string>, files: Array<File>) {
    return new Promise((resolve, reject) => {
      var formData: any = new FormData();
      var xhr = new XMLHttpRequest();
      for(var i = 0; i < files.length; i++) {
        formData.append("uploads[]", files[i], files[i].name);
      }
      xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) {
          if (xhr.status == 200) {
            resolve(JSON.parse(xhr.response));
          } else {
            reject(xhr.response);
          }
        }
      }
      var cd = "form-data,name='imageUpload'";
      xhr.open("POST", url, true);
      xhr.setRequestHeader("Content-Disposition", cd);
      xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    });
  }

  ngOnInit() {

  }
}

media.html

<input type="file" name="imageUpload" (change)="fileChangeEvent($event)" placeholder="Upload file..." />
<button type="button" (click)="upload()">Upload</button>