Before_request as middleware alternative 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'

Aroute

Bteardown_request

Cafter_request

Dbefore_request

Attempts:

3 left

💡 Hint

Common Mistakes

Using @app.route instead of @app.before_request

Using @app.after_request which runs after the request

Using @app.teardown_request which runs after response

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

2fill in blank

medium

Complete the code to access the current request path inside a before_request function.

Flask

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

@app.before_request
def check_path():
    path = request.[1]
    print(f"Request path is: {path}")

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

Aurl

Bmethod

Cpath

Dheaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.url which includes full URL

Using request.method which is HTTP method

Using request.headers which is request headers

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

3fill in blank

hard

Fix the error in the before_request function to correctly abort requests to '/forbidden'.

Flask

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

@app.before_request
def block_forbidden():
    if request.path == '/forbidden':
        [1](403)

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

Aabort()

Babort

Creturn abort

Dreturn abort()

Attempts:

3 left

💡 Hint

Common Mistakes

Returning abort instead of calling it

Calling abort with extra parentheses in the blank

Not calling abort at all

Calling abort(403) raises an HTTP 403 error immediately. You do not return it.

4fill in blank

hard

Fill both blanks to create a before_request function that sets a global variable and logs the request method.

Flask

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

@app.before_request
def setup():
    g.user = 'guest'
    print(f"Method: {request.[1]")
    g.[2] = 123

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

Amethod

Bpath

Cuser

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.path instead of request.method

Using g.user again instead of a new variable

Confusing variable names in g

request.method gives the HTTP method. g.id sets a global variable named 'id'.

5fill in blank

hard

Fill all three blanks to create a before_request function that checks a header and aborts if missing.

Flask

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

@app.before_request
def check_header():
    token = request.headers.get('[1]')
    if not token:
        [2](401)
    print(f"Token: {token}")
    request.[3] = token

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

AAuthorization

Babort

Ctoken

Dheaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong header name

Not calling abort correctly

Assigning token to request.headers instead of request.token

The header name is 'Authorization'. abort(401) stops unauthorized requests. request.token stores the token.