我试图调用一个服务，它在DHC中工作，但当我try 调用angular 2项目时，它崩溃了，方法请求是POST，从body接收一个对象，该对象具有邮箱和密码，响应是一个令牌，我将在整个项目中使用该令牌进行授权.

这是我的密码.

import { Injectable } from '@angular/core';
import { Http, Response, Headers, Request ,RequestOptions ,RequestMethod } from '@angular/http';
import {Observable} from 'rxjs/Rx';
import 'rxjs/add/operator/map';

@Injectable()
export class LoginService {
      constructor(private http:Http) { 
      }

  getToken(){
    var baseUrl = "xxx.xxx.x.xxx:xxxx/project/v1/admin/login";
    var headers = new Headers();
    headers.append("Content-Type", 'application/json');
    var options = new RequestOptions({ headers: headers });
    var objeto = {'email': 'xxxxxx', 'pass':'xxxx' } 
    var body2 = JSON.stringify(objeto);
    var xhr = new XMLHttpRequest();
    return this.http
       .post(baseUrl, body2, options)
       .map((response: Response) => response.json())
       .subscribe(
           data => console.log('Success uploading the opinion '+ data, data),
           error => console.error(`Error: ${error}`)
       );
  }
}

我try 从angular 2实现XMLHttp请求调用，但错误是一样的，我不知道是否可以在angular 2中使用它，下面是方法

return Observable.fromPromise(new Promise((resolve, reject) => {
  //  let formData: any = new FormData();     
    xhr.onreadystatechange = function () {
        if (xhr.readyState === 4) {
            if (xhr.status === 200) {
                resolve(JSON.parse(xhr.response));
            } else {
                reject(xhr.response);
            }
        }
    }
    xhr.open("POST", baseUrl, true);
    xhr.send(body2);
}));

Help :( and thank you