After_request hooks in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register an after_request hook in Flask.

Flask

from flask import Flask
app = Flask(__name__)

@app.[1]
def add_header(response):
    response.headers['X-Custom-Header'] = 'Value'
    return response

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

Abefore_request

Bafter_request

Croute

Derrorhandler

Attempts:

3 left

💡 Hint

Common Mistakes

Using @app.before_request instead of @app.after_request

Forgetting to return the response object

The @app.after_request decorator registers a function to run after each request to modify the response.

2fill in blank

medium

Complete the code to add a header 'X-Powered-By' with value 'Flask' in the after_request hook.

Flask

from flask import Flask
app = Flask(__name__)

@app.after_request
def add_powered_by(response):
    response.headers['[1]'] = 'Flask'
    return response

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AX-Powered-By

BContent-Type

CServer

DAuthorization

Attempts:

3 left

💡 Hint

Common Mistakes

Using standard headers like Content-Type instead of a custom header

Misspelling the header name

The header X-Powered-By is commonly used to indicate the technology powering the server.

3fill in blank

hard

Fix the error in the after_request hook to ensure the response is returned properly.

Flask

from flask import Flask
app = Flask(__name__)

@app.after_request
def fix_response(response):
    response.headers['Cache-Control'] = 'no-store'
    [1]

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Aresponse

Bprint(response)

Creturn response

Dpass

Attempts:

3 left

💡 Hint

Common Mistakes

Not returning the response object

Using print instead of return

The after_request function must return the response object to send it back to the client.

4fill in blank

hard

Fill both blanks to create an after_request hook that adds a header and logs the response status.

Flask

from flask import Flask
app = Flask(__name__)

@app.after_request
def log_and_header(response):
    response.headers['[1]'] = 'True'
    print('Response status:', response.[2])
    return response

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AX-Processed

Bstatus_code

Ccontent_length

DServer

Attempts:

3 left

💡 Hint

Common Mistakes

Using standard headers instead of custom ones

Accessing response.status instead of response.status_code

The header X-Processed is custom, and response.status_code gives the HTTP status code.

5fill in blank

hard

Fill all three blanks to create an after_request hook that adds two headers and modifies the response body length check.

Flask

from flask import Flask
app = Flask(__name__)

@app.after_request
def modify_response(response):
    response.headers['[1]'] = 'Yes'
    response.headers['[2]'] = 'No'
    if len(response.get_data()) [3] 1000:
        print('Large response')
    return response

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AX-Feature-1

BX-Feature-2

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using standard header names

Using wrong comparison operator like '<' instead of '>'

The headers X-Feature-1 and X-Feature-2 are custom. The condition checks if the response data length is greater than 1000 bytes.