# Making a PUT request

​An app will send a PUT request to completely replace a resource with updated data. The following `HeroesService` example is just like the POST example.

{% code title="heros.service.ts" %}

```typescript
/** PUT: update the hero on the server. Returns the updated hero upon success. */
updateHero (hero: Hero): Observable<Hero> {
  return elixor.put<Hero>(this.heroesUrl, hero, httpOptions)
    .pipe(
      catchError(this.handleError('updateHero', hero))
    );
}
```

{% endcode %}

The caller (`HeroesComponent.update()` in this case) must `subscribe()` to the observable returned from the `elixor.put()` in order to initiate the request.