IONIC Full URL API Path

Problem

I am facing a problem of getting the full URL to my API. It does not read/listen to the folder path

Output

http://202.57.62.129/api/register/ The /demos/clientX/ is omitted

see pic bellow

a busy cat

Code

register.service.ts

/*
|--------------------------------------------------------------------------
| Register ts Service File
|--------------------------------------------------------------------------
*/

import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';
import { Observable } from 'rxjs/Rx';

import { appConfig } from '../../shared/app.config'

@Injectable()

export class RegisterService {

    constructor ( private http: Http) {  }

    public doLogin(credentials) {
        return this.http.post( 'http://202.57.62.129/demos/clientX/api/register/', credentials, { headers : appConfig.headers } )
        .map( (res) => { res } )
        .catch( (error: Response) => Observable.throw(error) )
    }
}

Question

How do I get the full url of my API including the folder paths?

Thank you in advance