Dashboard card main function

getCardData(card: DashboardCard, i: number = 0) {

    let resource = card.resources[i];
    let variables = card.variables;

    let request = prepareRequest(resource, variables, card.pat);
    console.log(request.url);

    return this.http.get<string>(request.url, { headers: request.httpOptions }).subscribe(

      (data: string) => {
        postRequest(data, resource, variables);
        if(++i < card.resources.length) { this.getCardData(card, i); }
        else { card.isLoading = false; }
      },

      (error: any) => {
        console.log(`Backend server returned an error (${error.status} - ${error.message})`);
        card.isLoading = false;
        card.variables['status'] = 'Unknown';
      }
    );
  }
}