获取Angular Universal中的主机名和路径名信息

server.ts：

...
app.engine('html',(_,options,callback) => {
  let engine = ngExpressEngine({
    bootstrap: ServerAppModule,providers: [ { provide: 'host',useFactory: () => options.req.get('host') } ]
  });

  engine(_,callback)
})
...

app.component.ts：

import { Inject,Injector,PLATFORM_ID } from '@angular/core';
import { DOCUMENT,isPlatformServer } from '@angular/common';

...

constructor(@Inject(DOCUMENT) private document,private injector: Injector,@Inject(PLATFORM_ID) private platformId: Object) {
  if (isPlatformServer(this.platformId)) {
    console.log(this.injector.get('host'))
  } else {
    console.log('document: ',document.location.hostname);
  }
}

没有ngExpressEngine：

server.ts：

...
app.engine('html',callback) => {
  const opts = {
    document: template,url: options.req.url,extraProviders: [{ provide: 'host',useFactory: () => options.req.get('host') }]
  };
  renderModuleFactory(AppServerModuleNgFactory,opts)
    .then(html => callback(null,html));
});
...