204 No Content in Rest API - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return a 204 No Content response in a REST API.

Rest API

return Response(status_code=[1])

Drag options to blanks, or click blank then click option'

A204

B200

C404

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using 200 OK instead of 204 No Content

Using 404 Not Found which means resource missing

Using 500 Internal Server Error which means server error

The HTTP status code 204 means No Content, indicating the request was successful but there is no content to return.

2fill in blank

medium

Complete the code to send a 204 No Content response without any body in a Flask API.

Rest API

from flask import make_response

response = make_response('', [1])
return response

Drag options to blanks, or click blank then click option'

A204

B201

C200

D400

Attempts:

3 left

💡 Hint

Common Mistakes

Sending a non-empty body with 204 status

Using 200 OK status code instead of 204

Using 201 Created which is for resource creation

In Flask, to send a 204 No Content response, set the status code to 204 and provide an empty string as the body.

3fill in blank

hard

Fix the error in this Express.js code to correctly send a 204 No Content response.

Rest API

app.delete('/item/:id', (req, res) => {
  // delete item logic
  res.status([1]).end();
});

Drag options to blanks, or click blank then click option'

A200

B500

C204

D404

Attempts:

3 left

💡 Hint

Common Mistakes

Sending a message body with 204 status

Using 200 OK status with a message body

Using 404 Not Found when item is deleted

204 No Content responses must not include a message body. Using .send('Deleted') with 204 is incorrect. The code should set status 204 and send no content.

4fill in blank

hard

Fill both blanks to create a 204 No Content response in FastAPI without a response body.

Rest API

from fastapi import FastAPI, Response

app = FastAPI()

@app.delete('/resource/{id}')
async def delete_resource(id: int):
    # deletion logic here
    return Response(status_code=[1], content=[2])

Drag options to blanks, or click blank then click option'

A204

B200

CNone

Db''

Attempts:

3 left

💡 Hint

Common Mistakes

Using None as content which causes errors

Using 200 status code instead of 204

Sending non-empty content with 204 status

FastAPI's Response can send a 204 status with empty bytes content (b'') to indicate no content.

5fill in blank

hard

Fill all three blanks to correctly return a 204 No Content response in Django REST Framework.

Rest API

from rest_framework.response import Response
from rest_framework import status

def delete_item(request, pk):
    # deletion logic
    return Response(status=[1], data=[2], content_type=[3])

Drag options to blanks, or click blank then click option'

Astatus.HTTP_204_NO_CONTENT

BNone

C'application/json'

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Sending data with 204 status

Using raw 204 integer instead of status constant

Omitting content_type or using wrong type

In Django REST Framework, to send a 204 No Content response, use status.HTTP_204_NO_CONTENT, no data (None), and a content type like 'application/json'.

Practice

1. What does the HTTP status code 204 No Content indicate in a REST API response?

easy

A. The request failed due to a client error.

B. The request was successful but there is no content to return.

C. The server encountered an error processing the request.

D. The resource was created successfully.

Solution

1. Step 1: Understand the meaning of 204 status code

   The 204 status code means the server successfully processed the request but does not return any content in the response body.

2. Step 2: Compare with other status codes

   Other codes like 4xx indicate client errors, 5xx indicate server errors, and 201 indicates resource creation, so they do not match 204's meaning.

3. Final Answer:

   The request was successful but there is no content to return. -> Option B

4. Quick Check:

   204 means success with no content [OK]

Hint: 204 means success but no response body [OK]

Common Mistakes:

• Confusing 204 with 200 OK which usually returns content
• Thinking 204 means an error occurred
• Assuming 204 means resource creation

2. Which of the following is the correct way to send a 204 No Content response in a REST API using HTTP headers?

easy

A. Status: 200 OK\nContent-Length: 0

B. Status: 204 No Content\nContent-Type: application/json

C. Status: 204 No Content\nContent-Length: 0

D. Status: 404 Not Found

Solution

1. Step 1: Identify correct status and headers for 204

   204 No Content must have status line '204 No Content' and usually a 'Content-Length: 0' header to indicate no body.

2. Step 2: Eliminate incorrect options

   Status: 204 No Content\nContent-Type: application/json wrongly includes Content-Type which is unnecessary for no content; Status: 200 OK\nContent-Length: 0 uses 200 OK, not 204; Status: 404 Not Found is unrelated 404 error.

3. Final Answer:

   Status: 204 No Content\nContent-Length: 0 -> Option C

4. Quick Check:

   204 with Content-Length 0 is correct [OK]

Hint: 204 must have Content-Length: 0 header [OK]

Common Mistakes:

• Including Content-Type header unnecessarily
• Using 200 OK instead of 204
• Sending body content with 204 status

3. Consider this REST API code snippet in Python Flask:

from flask import Flask, jsonify, make_response
app = Flask(__name__)

@app.route('/delete_item/', methods=['DELETE'])
def delete_item(id):
    # Assume item is deleted successfully
    return make_response('', 204)

if __name__ == '__main__':
    app.run()

What will be the HTTP status code and response body when a client calls DELETE /delete_item/5?

medium

A. Status code 204 with empty response body

B. Status code 200 with JSON response body

C. Status code 404 with error message

D. Status code 500 with server error

Solution

1. Step 1: Analyze the return statement in the Flask route

   The function returns make_response with empty string and status 204, which means no content is sent back.

2. Step 2: Understand HTTP 204 behavior

   204 status means success with no response body, so the client receives status 204 and empty body.

3. Final Answer:

   Status code 204 with empty response body -> Option A

4. Quick Check:

   Flask returns 204 with no content [OK]

Hint: 204 means success with empty body in Flask [OK]

Common Mistakes:

• Expecting JSON response body with 204
• Confusing 204 with 200 OK
• Assuming error status codes

4. A developer wrote this Express.js code to send a 204 response:

app.delete('/item/:id', (req, res) => {
  res.status(204).send({ message: 'Deleted' });
});

What is the problem with this code regarding the 204 No Content response?

medium

A. 204 responses must not include a response body, but this sends JSON content.

B. The status code should be 200 instead of 204 for delete operations.

C. The route method should be GET, not DELETE.

D. The response is missing a Content-Type header.

Solution

1. Step 1: Understand 204 No Content rules

   204 status means no response body should be sent, but the code sends JSON content in the body.

2. Step 2: Identify the violation in the code

   Calling send() with an object adds a response body, which violates 204 semantics.

3. Final Answer:

   204 responses must not include a response body, but this sends JSON content. -> Option A

4. Quick Check:

   204 must not send body [OK]

Hint: Never send body with 204 status [OK]

Common Mistakes:

• Sending JSON or text body with 204 status
• Using wrong HTTP method for delete
• Confusing 204 with 200 OK

5. You are designing a REST API for updating user profiles. After a successful update, you want to respond with 204 No Content. Which of the following is the best practice to implement this behavior?

hard

A. Return status 204 with a JSON body confirming the update.

B. Return status 201 with a Location header pointing to the updated resource.

C. Return status 200 with the updated user profile in the response body.

D. Return status 204 with an empty response body and no Content-Type header.

Solution

1. Step 1: Understand 204 usage for update operations

   204 No Content is ideal for successful updates when no response body is needed.

2. Step 2: Identify best practice for 204 response

   Best practice is to send status 204 with empty body and omit Content-Type header to avoid confusion.

3. Final Answer:

   Return status 204 with an empty response body and no Content-Type header. -> Option D

4. Quick Check:

   204 means success with no content [OK]

Hint: 204 means success, no body, no Content-Type header [OK]

Common Mistakes:

• Sending JSON body with 204 status
• Using 201 Created for update instead of 204
• Returning 200 OK with body when 204 is preferred