error Response with status: 0 for URL: null

I got error, When I try to call api.
I test the app at ionic lab -c.

url is my Vhost server in my computer.

import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/toPromise';

export class Api {
  url: any = 'http://myurl.local/api/';

  headers = new Headers(
    'Content-Type' : 'application/json'
  options = new RequestOptions({ headers: this.headers });

  constructor(public http: Http) {
    console.log('Hello API Provider');

  login(username, password) {
    console.log('/////////// API Login //////////////');
    let data = {
      'service' : 'login',
      'login_type' : 1,
      'username' : username,
      'password' : password
    let fullUrl = this.url+'login';
    console.log(fullUrl, data);
    return new Promise((resolve, reject) => {, data, this.options)
      .then((response) =>
        console.log('API Response : ', response);
      .catch((error) =>
        console.error('API Error : ', error.toString());

That is error i got.

[11:30:57]  console.log: /////////// API Login ////////////// 
[11:30:57]  error opening ws message: 
[11:30:57]  console.error: API Error : Response with status: 0 for URL: null 

But in my API server, I already add 'Access-Control-Allow-Origin' => '*' in my code.
I try to read some forum, But i am not under stand it.

Cordova CLI: 6.5.0
Ionic Framework Version: 3.1.0
Ionic CLI Version: 2.2.3
Ionic App Lib Version: 2.2.1
Ionic App Scripts Version: 1.3.5
ios-deploy version: 1.9.1
ios-sim version: 5.0.13
OS: macOS Sierra
Node Version: v6.9.5
Xcode version: Xcode 8.3.2 Build version 8E2002

I’m confused as to why you’re trying to set CORS headers on the client. I thought those are supposed to be managed by the server. I also see absolutely no reason for you to be explicitly instantiating a Promise.

This function was in providers, I call it from my page function and wait for response.

What is the request to and response from your server? Use dev tools to look at the headers and body of the messages - something is probably wrong in there.