1this.authenticationService.login(this.f.email.value, this.f.password.value)
2  .pipe(first())
3  .subscribe(
4    (data: HttpResponse<any>) => {
5      console.log(data.headers.get('authorization'));
6    },
7    error => {
8      this.loading = false;
9    });
10
11At my Service Side.
12
13return this.http.post<any>(Constants.BASE_URL + 'login', {username: username, password: password},
14  {observe: 'response' as 'body'})
15  .pipe(map(user => {
16       return user;
17  }));