Client-server architecture in Rest API - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this simple REST API client request?

Consider this Python code using requests to get data from a server:

import requests
response = requests.get('https://jsonplaceholder.typicode.com/posts/1')
print(response.status_code)

What will this print?

Rest API

import requests
response = requests.get('https://jsonplaceholder.typicode.com/posts/1')
print(response.status_code)

A 403

B 500

C 200

D 404

💡 Hint

Think about what status code means a successful GET request.

A status code of 200 means the server successfully found and returned the requested resource.

🧠 Conceptual

intermediate

Which component is responsible for processing client requests in client-server architecture?

In a client-server model, which part handles the incoming requests and sends back responses?

A Database

B Client

C Router

D Server

💡 Hint

Think about who listens and responds to requests.

The server processes requests from clients and sends back responses.

🔧 Debug

advanced

What error will this REST API client code raise?

Look at this Python code snippet:

import requests
response = requests.get('https://jsonplaceholder.typicode.com/posts/abc')
print(response.json()['id'])

What error will occur when running this code?

A KeyError

B JSONDecodeError

C TypeError

D No error, prints 'abc'

💡 Hint

Check what the server returns for an invalid post id and what keys exist in the JSON.

The server returns an empty object {} for invalid id, so accessing ['id'] causes a KeyError.

📝 Syntax

advanced

Which option correctly sends JSON data in a POST request?

Which Python code snippet correctly sends JSON data to a REST API server?

A requests.post(url, data={'name': 'Alice'})

B requests.post(url, json={'name': 'Alice'})

C requests.post(url, body={'name': 'Alice'})

D requests.post(url, payload={'name': 'Alice'})

💡 Hint

Remember the parameter that automatically encodes JSON in requests.

The json parameter sends JSON-encoded data with correct headers.

🚀 Application

expert

How many items will this server return in the JSON list?

A REST API server returns this JSON response for GET /users?active=true:

[{"id":1,"active":true},{"id":2,"active":true},{"id":3,"active":false},{"id":4,"active":true}]

How many user objects will the client receive if the server filters correctly?

A 3

B 4

C 2

D 1

💡 Hint

Count only users with active set to true.

There are 3 users with active":true in the list.