Angular Web Framework HTTP Client & API Integration

Question 1

Which Angular module must be imported into AppModule to enable HttpClient throughout an application?

Accepted Answer

HttpClientModule

Answer

HttpModule

Answer

HttpClientXsrfModule

Answer

FormsModule

Question 2

What return type does HttpClient.get() produce by default?

Accepted Answer

Observable<T>

Answer

Promise<T>

Answer

Subject<T>

Answer

BehaviorSubject<T>

Question 3

What is the primary purpose of an HttpInterceptor in Angular?

Accepted Answer

To intercept and transform HTTP requests and responses globally

Answer

To cache HTTP responses in localStorage

Answer

To validate form data before sending

Answer

To compress HTTP payloads automatically

Question 4

Which HttpClient request option causes it to return the full HTTP response including status code and headers?

Accepted Answer

observe: 'response'

Answer

responseType: 'blob'

Answer

observe: 'events'

Answer

withCredentials: true

Question 5

How do you pass query string parameters to an HttpClient.get() request in Angular?

Accepted Answer

Use the params option with an HttpParams object or plain object

Answer

Append them manually to the URL string

Answer

Use the headers option

Answer

Set them in the request body

Question 6

Which RxJS operator is most appropriate for catching and recovering from HTTP errors in an Angular service?

Accepted Answer

catchError

Answer

map

Answer

tap

Answer

filter

Question 7

What decorator is required on a class to allow Angular's DI system to inject HttpClient into it?

Accepted Answer

@Injectable()

Answer

@Inject(HTTP_CLIENT)

Answer

@NgModule()

Answer

@Component()