Check login credentials on HackerNews with Angular

I'm creating an interface for hackers news with angular 7. Normally I use the public APIs available, but for login services they are not available.

I'm trying to make a POST call, as done by an OpenSource Android Client app for HN, specifically in this file: https://github.com/hidroh/materialistic/blob/master/app/src/main/java/io/github/hidroh/materialistic/accounts/UserServicesClient.java to the url https://news.ycombinator.com/login , setting the username, password and redirect as parameters.

Unfortunalty my request is blocked by the CORS policy

This is my code:

const payload = {
  'acct': 'username',
  'pw': 'password',
  'goto': 'news'
};

const httpOptions = {
  headers: new HttpHeaders({
    'Content-Type': 'application/json',
    'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Methods': 'POST, GET, OPTIONS, PUT, DELETE, HEAD',
    'Access-Control-Allow-Headers': 'X-PINGOTHER, Origin, X-Requested-With, Content-Type, Accept',
    'Access-Control-Allow-Access-Control-Max-Age': '1728000',
  })
};

console.log('Try login');
this.http.post('https://news.ycombinator.com/login', payload, httpOptions)
  .pipe(
    tap(
      data => console.log(data),
      error => console.log(error)
    )
  ).subscribe(result => console.log(result));

how could I solve?

from Check login credentials on HackerNews with Angular