How to get full base URL (including server, port and protocol) in Angular Universal?

I have bit of working code with angular 5 and angular universal

in server.ts replace this

app.engine('html', (_, options, callback) => {
    let engine = ngExpressEngine({
        bootstrap: AppServerModuleNgFactory,
        providers: [
            { provide: 'request', useFactory: () => options.req, deps: [] },
            provideModuleMap(LAZY_MODULE_MAP)
        ]
    });
    engine(_, options, callback);
});

and in Angular side you can get host with below code

export class AppComponent {
    constructor(
        private injector: Injector,
        @Inject(PLATFORM_ID) private platformId: Object
    ) {
        console.log('hi, we\'re here!');
        if (isPlatformServer(this.platformId)) {
            let req = this.injector.get('request');
            console.log("locales from crawlers: " + req.headers["accept-language"]);
            console.log("host: " + req.get('host'));
            console.log("headers: ", req.headers);
        } else {
            console.log('we\'re rendering from the browser, there is no request object.');
        }
    }
}

Now I'm using the server.ts ngExpressEngine:

import { ngExpressEngine } from '@nguniversal/express-engine';

const {AppServerModuleNgFactory, LAZY_MODULE_MAP} = require('./dist/server/main.bundle');

    const {provideModuleMap} = require('@nguniversal/module-map-ngfactory-loader');

    app.engine('html', ngExpressEngine({
        bootstrap: AppServerModuleNgFactory,
        providers: [
            provideModuleMap(LAZY_MODULE_MAP)
        ]
    }));

And after that I can use in location.service.ts:

constructor(@Optional() @Inject(REQUEST) private request: any,
            @Optional() @Inject(RESPONSE) private response: any,
            @Inject(PLATFORM_ID) private platformId: Object)
{
  if (isPlatformServer(this.platformId))
  {
    console.log(this.request.get('host’)); // host on the server
  } else
  {
    console.log(document.location.hostname); // host on the browser
  }
}