Angular2 's Http.post is not returning headers

Question

I am doing a call to a REST endpoint. I want to add a resource (below). However, when my service calls Http's post method it will invoke the request but the response's header(s) are not returned. At least, I experience an empty headers object of the Response instance. (??) I do expect response header. In particular I expect the Location header as part of a "REST ADD RESOURCE" pattern. The Location headers contains the URL of the newly created resource.

The weird thing about this: when I call my API directly (thus not via Angular2), I get the exact response but this time with (all) expected headers including the Location response header.

Uhh, is there something wrong with Http.post or am I doing something wrong?

Mind you: My service returns an Observable Response in this example. This is not the intended class type to return to the caller. I am using it for the convenience of understanding what is happening with the post response. In reality it is my intention to pass the url stored in the Location header.

addModel(model: any): Observable<Response> {
let token = this.loginService.auth.accessToken;
let headers = new Headers({
  'Content-Type': 'application/json',
  'Accept': 'application/json',
  'Authorization': `Bearer ${token}`
});
let options = new RequestOptions({headers: headers});
let data: string = JSON.stringify(model);
return this.http.post(this.url, data, options)

  // .map(r => {
  //   console.log("Response ", r);
  //   return r.headers.get("Location"); // THERE IS NOTHING IN headers (?). Don't understand.
  // })
  .catch(err => Observable.throw(err));
 }

Answer 1

With a CORS request the server needs to add Allow-access-expose-headers: headername otherwise the returned headers won't be available to JS.

You can investigate the request response in the browsers devtools (network tab AFARK) if the response actually contains the headers?