Angular 2：EXCEPTION：响应状态：URL为0：null

3     229881   group    EXCEPTION: Response with status: 0  for URL: null
4     229895   error    EXCEPTION: Response with status: 0  for URL: null
5     229909   groupEnd
6     229950   error    Uncaught Response with status: 0  for URL: null,http://192.168.178.49:8100/build/js/app.bundle.js,Line: 95774

仍然：

>在www.hurl.it上测试时,具有相同URL的GET请求有效
>从应用程序调用的GET请求使用不同的URL,例如让URL =“https://httpbin.org/get?name=hannes”

入职-load.ts：

import { Component } from '@angular/core';
import { NavController,Platform,Alert } from 'ionic-angular';
import { OnboardingHelloPage } from '../onboarding-hello/onboarding-hello';
import { CordovaOauth,LinkedIn } from 'ng2-cordova-oauth/core';    
import { Http,Headers,RequestOptions } from '@angular/http';
import 'rxjs/add/operator/map'


@Component({
  templateUrl: 'build/pages/onboarding-load/onboarding-load.html',})
export class OnboardingLoadPage {
  private data;
  private code;

constructor(private navCtrl: NavController,private platform: Platform,private http: Http) {
    this.http = http;
    this.navCtrl = navCtrl;
  }

public getProfileData() {
  let URL = "https://api.linkedin.com/v1/people/~?oauth2_access_token=SOMEVALIDTOKEN&format=json";
  //let URL = "https://httpbin.org/get?name=hannes"

  this.http.get(URL)
    .map(res => res.json())
    .subscribe(data => {
      this.data = data;
      console.log(JSON.stringify(data));
  });
  // go to next page
  this.viewOnboardingHello();
}
...
}