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

Client-Origin Request Service — speeds up API requests

Answer

Cross-Object Resource Serialization — handles JSON encoding

Answer

Cached Object Response System — improves API caching

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

Accept

Answer

Authorization

Answer

X-Request-ID

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 error tag for failed responses

Answer

An authentication token format

Answer

An XML element type indicator

Question 4

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

Accepted Answer

/users/5

Answer

/getUser?id=5

Answer

/user/get/5

Answer

/api?action=getUser&id=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 are faster; asynchronous calls are slower

Answer

Synchronous uses HTTP; asynchronous uses WebSockets only

Answer

There is no functional difference

Question 6

Which format is most commonly used for REST API request and response bodies?

Accepted Answer

JSON

Answer

XML

Answer

CSV

Answer

YAML