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61 Injectable from Headers Http from Hero from Injectable HeroService private heroesUrl constructorprivate http Http getHeroes PromiseHero ... . .response response.. .. getHeroid number . .heroes heroes.hero hero. id savehero Hero PromiseHero hero. .hero .hero hero Hero let headers Headers headers. let url `$.$hero.` . .url headers . .. private posthero Hero PromiseHero let headers Headers . .. JSON.hero headers headers . .res res.. .. private puthero Hero let headers Headers headers. let url `$.$hero.` . .url headers headers . .