Return a 404 or 500 status code

[tislars]

• I'm submitting a ...

- [ ] bug report
- [x] feature request

• What modules are related to this Issue?

- [ ] aspnetcore-engine
- [ ] common
- [x] express-engine
- [ ] hapi-engine
- [ ] module-map-ngfactory-loader

• Do you want to request a feature or report a bug?
  Feature

• What is the current behavior?
  When the user ends up on a non-existing page, the browser returns a 200 http status code.

• What is the expected behavior?
  I'd would like to be able to return a 404 or 500 status code.

• What is the motivation / use case for changing the behavior?
  For SEO it is important to return correct status codes.

• Please tell us about your environment:

 - Angular version: 4
 - Browser: all
 - Language: Typscript
 - OS:  Mac OS X
 - Platform: NodeJS

• Other information
  I followed this solution from a previous reported issue. However, my server.ts differs from theirs, as mine is the same as the official repository' one.

[Gorniv]

you can use https://github.com/Angular-RU/angular-universal-starter/blob/master/src/app/not-found/not-found.component.ts and https://github.com/Angular-RU/angular-universal-starter/blob/d993c2541e8208d8c74ff3a47fd1691b28a7a0f4/src/app/not-found/not-found.service.ts for 404 status code

[Toxicable]

duplicate of angular/angular#55281

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