express-redirect-platform-location.ts

import { Injectable, Optional, Inject } from '@angular/core';
import { APP_BASE_HREF } from '@angular/common';
import { NodePlatformLocation, REQUEST_URL, ORIGIN_URL } from 'angular2-platform-node';
import { Response, Request } from 'express';


/**
 * Issue HTTP 302 redirects on internal redirects
 */
@Injectable()
export class ExpressRedirectPlatformLocation extends NodePlatformLocation {

  // fix AOT by explicitly defining the constructor
  // error TS2346: Supplied parameters do not match any signature of call target.
  constructor(@Optional() @Inject(ORIGIN_URL) originUrl: string,
              @Optional() @Inject(REQUEST_URL) requestUrl: string,
              @Optional() @Inject(APP_BASE_HREF) baseUrl?: string) {
    super(originUrl, requestUrl, baseUrl);
  }

  pushState(state: any, title: string, url: string): void {
    let req: Request = Zone.current.get('req');
    let res: Response = Zone.current.get('res');

    if (url !== req.url) {  // ?? Zone.current.get('requestUrl')
      if (res.finished) {
        console.warn('Attempted to redirect on a finished response. From', req.url, 'to', url);
      } else {
        console.log('Redirecting from', req.url, 'to', url);
        res.redirect(url);
        res.end();
        // I haven't found a way to correctly stop Angular rendering.
        // So we just let it end its work, though we have already closed
        // the response.
      }
    }

    return super.pushState(state, title, url);
  }

}

server.module.ts

import { PlatformLocation } from '@angular/common';
...

@NgModule({
  bootstrap: [ AppComponent ],
  imports: [
    ...
  ],
  providers: [
    { provide: PlatformLocation, useClass: ExpressRedirectPlatformLocation },

    ...
  ],
})
export class MainModule {

}