angular 2 - httpClient is returning empty headers

Question

I am executing a web service using httpClient, but my problem is that the response headers are always empty, I already check this and this and can't make it work, this is my service:

iniciarSesion(usuario: Usuario) {

const idSistema = environment.idSistema;
const url = environment.url + environment.mssesiones;
return this.httpClient.post(
  url,
  {
    usuario: usuario.usuario,
    contrasena: usuario.contrasena,
    idSistema: idSistema
  },
  {
    headers: new HttpHeaders({
      'Content-Type':  'application/json'
    }),
    observe : 'response'
  });
}

And this is the component that execute the service:

this.inicioSesionService.iniciarSesion(usuario).subscribe(
        (httpResponse: HttpResponse<Object>) => {
          console.log(httpResponse);
      });

Can someone help me with this issue?,

Thanks in advance.

Alan Gaytan · Accepted Answer · 2018-06-21 16:43:10Z

1

After searching I found that the problem was the service(spring boot service), I needed to add the Access-Control-Expose-Headers like this:

headers.add("authorization", jwtUtil.generateToken(usuario, peticion.getRemoteAddr()));
headers.add("Access-Control-Expose-Headers", "authorization");

I notice that the httpResponse was returning empty headers until I execute:

httpResponse.headers.get('authorization');

After that execution the console.log display the header information, I don't understand the behavior of that but now is working.

answered Jun 21, 2018 at 16:43

Alan Gaytan

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1 Comment

Imtiaz Shakil Siddique Over a year ago

I also faced similar issue. I've set headers from server side to allow & expose all required headers. But still I keep getting empty headers in client side (Angular 6). But when I execute response.headers.get('Content-Type'); suddenly, I get all headers!!!

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