caching-article-first-attempt-service.ts

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpClient, HttpParams } from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})
export class ProductService {
  
  private readonly URL = 'https://world.openfoodfacts.org/api/v0/product/';

  constructor(private http: HttpClient) {
  }

  resolveProduct(code: string): Observable<any> {
    console.log('Request is sent!')
    return this.http.get(this.URL+code+'.json');
  }
}