Error handler decorators in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an error handler for 404 errors in Flask.

Flask

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

@app.errorhandler([1])
def not_found_error(error):
    return render_template('404.html'), 404

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

A500

B404

C403

D400

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong error code like 500 or 403.

Forgetting to use the @app.errorhandler decorator.

The @app.errorhandler(404) decorator tells Flask to use this function when a 404 Not Found error occurs.

2fill in blank

medium

Complete the code to handle 500 Internal Server Error using a decorator.

Flask

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

@app.errorhandler([1])
def internal_error(error):
    return render_template('500.html'), 500

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

A403

B404

C500

D400

Attempts:

3 left

💡 Hint

Common Mistakes

Using 404 instead of 500.

Not returning the correct status code with the response.

The @app.errorhandler(500) decorator is used to catch server errors and display a custom page.

3fill in blank

hard

Fix the error in the code to correctly register a handler for 403 Forbidden errors.

Flask

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

@app.errorhandler([1])
def forbidden_error(error):
    return render_template('403.html'), 403

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

A403

Berror403

CForbidden

D'403'

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number.

Using a string or variable name instead of the code.

The error code must be an integer, not a string or a name. So 403 is correct.

4fill in blank

hard

Fill both blanks to create a handler for 400 Bad Request errors that returns a JSON response.

Flask

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

@app.errorhandler([1])
def bad_request(error):
    response = jsonify({'error': 'Bad Request'})
    response.status_code = [2]
    return response

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

A400

B404

C500

D403

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching the decorator code and status code.

Using codes for other errors like 404 or 500.

Both the decorator and the status code must be 400 to handle Bad Request errors properly.

5fill in blank

hard

Fill both blanks to create a custom error handler for 401 Unauthorized errors that returns a JSON message.

Flask

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

@app.errorhandler([1])
def unauthorized(error):
    response = jsonify({'message': 'Unauthorized access'})
    response.status_code = [2]
    return response

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

A401

B403

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using 403 Forbidden instead of 401.

Mismatching decorator and status code.

The error handler and status code must be 401 for Unauthorized errors. The JSON message explains the error.