X-Session →1948c514b7e5669c284e85d6f612f9bd491
X-Session-Expiry →2038-08-02T09:19:03+00:00

login(username, password) {
    const data = {
      username: username,
      password: password
    };
    const headers = new HttpHeaders();
    headers.set('Content-Type', 'application/json');
    return this.http.post(this.login_url, data, { headers: headers });
  }