ionic proxy config

APIConfig.ts

import { Platform } from 'ionic-angular'; 
import { InjectionToken, Injectable } from "@angular/core"; 
 
export let APP_CONFIG = new InjectionToken<string>('apiConfig'); 
export function APIConfig(plat: Platform) { 
 
  const _browser = '/api'; // reverse proxy
  const _device = 'http://192.168.0.100/api'; 
 
  return plat.is('core') ? _browser : _device; 
} 

app.module.ts

import { APP_CONFIG, APIConfig } from "./../services/APIConfig";
import { IonicApp, IonicErrorHandler, IonicModule, Platform } from 'ionic-angular';
@NgModule({
  providers: [
      { provide: APP_CONFIG, useFactory: APIConfig, deps: [Platform] } 
  ]
})
export class AppModule {}

app.service.ts

@Injectable()
export class AppService {
  constructor(@Inject(APP_CONFIG) endPoint:string) { 
    this.endPoint = endPoint;
  }
}