API error handling in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class.

Flask

from flask import [1]
app = [1](__name__)

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

AFlask

BResponse

CRequest

Djsonify

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using jsonify instead of Flask

Forgetting to import Flask

You need to import Flask to create the app instance.

2fill in blank

medium

Complete the code to return a JSON error response with status 404.

Flask

from flask import jsonify

@app.route('/item/<int:id>')
def get_item(id):
    item = None  # pretend we look for item
    if not item:
        return jsonify({'error': 'Item not found'}), [1]

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

A403

B200

C500

D404

Attempts:

3 left

💡 Hint

Common Mistakes

Using 200 instead of 404

Using 500 which means server error

Using 403 which means forbidden

HTTP status code 404 means 'Not Found', which fits this error.

3fill in blank

hard

Fix the error in the code to handle 400 Bad Request errors globally.

Flask

@app.errorhandler([1])
def bad_request(error):
    return jsonify({'error': 'Bad request'}), 400

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

A404

B403

C400

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using 404 instead of 400

Using 500 which is server error

Using 403 which means forbidden

The error handler must match the 400 status code to catch bad requests.

4fill in blank

hard

Fill both blanks to create a custom error handler for 404 errors returning JSON.

Flask

@app.errorhandler([1])
def not_found(error):
    response = [2]({'error': 'Resource not found'}, 404)
    return response

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

A404

Bjsonify

Cmake_response

Dabort

Attempts:

3 left

💡 Hint

Common Mistakes

Using jsonify alone without make_response

Using abort inside error handler

Using wrong error code

The decorator uses 404 to catch not found errors, and make_response creates a response with JSON and status code.

5fill in blank

hard

Fill all three blanks to raise a 400 error with a custom message using abort.

Flask

from flask import abort

@app.route('/submit', methods=['POST'])
def submit():
    data = request.json
    if not data or 'name' not in data:
        abort([1], description=[2])
    return 'Success', 200

@app.errorhandler([3])
def handle_bad_request(e):
    return jsonify(error=str(e.description)), 400

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

A400

B'Missing name field'

D'Invalid data'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong status code in abort

Not providing a description string

Mismatch between abort code and errorhandler code

Use abort with 400 and a description string. The error handler catches 400 errors and returns JSON with the message.