How to get a cookie in Angular and save it?

Question

Angular

I'm trying to fetch the cookie, because using the standard Angular httpClient, cookies are not saved and I can't get them.
I write like this

public urlapi = 'https://server.com/api';
  private httpOptions = {
    headers: new HttpHeaders({
      'Content-Type':  'application/json',
      'X-SourceId': '11111111111'
    })
  };  //если я добавлю withCredentials: boolean, то сервер не отдаёт данные

this.http
      .post(this.urlapi, postBody, this.httpOptions)
      .pipe(map(data => { ........... }

I get the data, but I can’t get the headers, and the cookies themselves are not overwritten. What can be done? Thanks