iOS Development iOS Networking and APIs 2

Question 1

What is certificate pinning in iOS networking?

Accepted Answer

Validating a server's certificate against a known copy bundled in the app

Answer

Certificate pinning prevents man-in-the-middle attacks by comparing the server's certificate to a trusted copy embedded in the app bundle.

Question 2

What does an HTTP 401 status code mean?

Accepted Answer

Unauthorized — the request requires valid authentication

Answer

HTTP 401 Unauthorized means the request lacks valid authentication credentials and the client should authenticate before retrying.

Question 3

Which URLSession configuration runs tasks even when the app is suspended?

Accepted Answer

background

Answer

A background URLSession configuration allows downloads and uploads to continue after the app moves to the background or is suspended.

Question 4

What is the Combine framework's role in iOS networking?

Accepted Answer

Provides a reactive, publisher-based API for processing asynchronous events like network responses

Answer

Combine lets you chain URLSession responses as publishers, applying operators like `map`, `decode`, and `catch` in a reactive pipeline.

Question 5

What is a REST API in iOS development context?

Accepted Answer

An HTTP-based API that uses standard methods (GET/POST/PUT/DELETE) and stateless requests

Answer

REST APIs use standard HTTP methods and stateless request/response cycles, making them the most common backend communication pattern in iOS apps.

iOS Development Practice Test