card.service.ts

    public getDetailedInfo(card): Observable<Card> {
        return this.http.get(`${this.privateUrl}${card.name}`)
            .map(this.extractData)
            .publishReplay(1)
            .refCount();
    }

    private extractData(res: Response) {
        let body = res.json();
        return new Card(body.data.name, body.data.card_type, body.data.text);
    }