Before_request hooks in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register a function that runs before each request in Flask.

Flask

from flask import Flask
app = Flask(__name__)

@app.[1]
def before():
    print("This runs before each request")

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

Abefore_request

Broute

Cteardown_request

Dafter_request

Attempts:

3 left

💡 Hint

Common Mistakes

Using @app.route instead of @app.before_request

Using @app.after_request which runs after requests

The @app.before_request decorator registers a function to run before each request.

2fill in blank

medium

Complete the code to abort the request with a 403 error inside a before_request function.

Flask

from flask import Flask, abort
app = Flask(__name__)

@app.before_request
def check():
    if not authorized():
        [1](403)

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

Aredirect

Babort

Craise

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using return 403 which does not stop the request properly

Using raise without an exception

The abort(403) function stops the request and returns a 403 Forbidden error.

3fill in blank

hard

Fix the error in the before_request function to correctly access the request path.

Flask

from flask import Flask, request
app = Flask(__name__)

@app.before_request
def log_path():
    print("Request path:", request.[1])

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

Apath

Burl

Cfull_path

Dendpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.url which includes the full URL

Using request.endpoint which is the function name

The request.path attribute gives the URL path of the current request.

4fill in blank

hard

Fill both blanks to create a before_request function that sets a global variable and checks a header.

Flask

from flask import Flask, g, request, abort
app = Flask(__name__)

@app.before_request
def before():
    g.user = request.headers.get([1])
    if g.user is None:
        [2](401)

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

A"X-User"

Babort

C"Authorization"

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Using return instead of abort to stop the request

Using wrong header names

The header X-User is checked, and abort(401) stops unauthorized requests.

5fill in blank

hard

Fill all three blanks to create a before_request hook that logs the method, path, and aborts if method is POST.

Flask

from flask import Flask, request, abort
app = Flask(__name__)

@app.before_request
def check_post():
    print("Method:", request.[1])
    print("Path:", request.[2])
    if request.method == [3]:
        abort(405)

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

Amethod

Bpath

C"POST"

D"GET"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'GET' instead of 'POST' to check method

Using request.url instead of request.path

This code prints the HTTP method and path, then aborts with 405 if the method is POST.