non-naive.ts

resolveProduct(code: string): Observable<any> {
    if (this.cache[code]) {
      console.log('Returning cached value!')
      return this.cache[code];
    }
    
    console.log('Do the request again')
    this.cache[code] = this.http.get(this.URL+code+'.json').pipe(
      shareReplay(1),
      catchError(err => {
          delete this.cache[code];
          return EMPTY;
      }));
}