loginUser(username, password) {
    const headers = new HttpHeaders({
      'Content-Type': 'application/x-www-form-urlencoded'
    });
    const userData = `username=${username}&password=${password}`; 
    const url = 'https://swift-footed-config.000webhostapp.com';
    return new Promise((resolve, reject) => {
      this.http
        .post(`${url}/wp-json/jwt-auth/v1/token`, userData, { headers })
        .subscribe(
          res => {
            resolve(res);
          },
          err => {
            resolve(err);
          }
        );
    });
  }