Back-End Development RESTful API Design and Development 3

Question 1

What does CORS stand for and why is it important in REST APIs?

Accepted Answer

Cross-Origin Resource Sharing — controls which domains can access the API

Answer

CORS is a browser security feature that allows or restricts web pages from making requests to a different domain than the one that served the page.

Question 2

Which HTTP header is used to specify the format of the request body sent to a REST API?

Accepted Answer

Content-Type

Answer

The Content-Type header tells the server the media type of the request body, such as application/json or multipart/form-data.

Question 3

What is an ETag in the context of REST APIs?

Accepted Answer

A version identifier for a resource used for caching and conditional requests

Answer

An ETag is a unique identifier for a specific version of a resource, enabling cache validation and preventing lost updates via conditional requests.

Question 4

In REST API design, what is the correct URL pattern for retrieving a specific user by ID?

Accepted Answer

/users/5

Answer

RESTful conventions use nouns (plural) for resource names and embed identifiers in the path, like /users/5.

Question 5

What is the difference between synchronous and asynchronous API calls?

Accepted Answer

Synchronous calls block until a response is received; asynchronous calls allow the program to continue while waiting

Answer

Synchronous calls block the calling thread until the response returns, while asynchronous calls use callbacks, promises, or async/await to handle the response later.

Back-End Development Practice Test

Back-End Development Practice Test

Back-End Development RESTful API Design and Development 3