File size limits in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the maximum allowed file size to 2 megabytes in a Flask app.

Flask

app.config['MAX_CONTENT_LENGTH'] = [1]

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

A2 * 1024 * 1024

B2048

C2

D1024 * 1024

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 instead of bytes value

Using 2048 which is kilobytes, not bytes

Using 1024 * 1024 which is 1 MB, not 2 MB

The MAX_CONTENT_LENGTH config expects the size in bytes. 2 megabytes equals 2 * 1024 * 1024 bytes.

2fill in blank

medium

Complete the code to handle the error when a user uploads a file larger than the limit in Flask.

Flask

@app.errorhandler([1])
def handle_file_too_large(e):
    return 'File too large', 413

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

A413

BRequestEntityTooLarge

C413 Request Entity Too Large

DRequestEntityTooLargeException

Attempts:

3 left

💡 Hint

Common Mistakes

Using status code 413 instead of exception class

Using incorrect exception class name

Using string with status code and message

Flask raises RequestEntityTooLarge exception when the file size exceeds the limit. This is used in the error handler decorator.

3fill in blank

hard

Fix the error in the code to correctly limit file size and handle errors in Flask.

Flask

from flask import Flask, request
from werkzeug.exceptions import [1]

app = Flask(__name__)
app.config['MAX_CONTENT_LENGTH'] = 1 * 1024 * 1024

@app.errorhandler(RequestEntityTooLarge)
def file_too_large(e):
    return 'File too big', 413

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

AFileTooLarge

BRequestEntityTooLargeError

CRequestTooLarge

DRequestEntityTooLarge

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong exception class name causing import errors

Not importing the exception at all

Using a made-up exception name

The correct exception to import from werkzeug.exceptions is RequestEntityTooLarge. Other names are invalid and cause import errors.

4fill in blank

hard

Fill both blanks to create a Flask route that rejects files larger than 500 KB and returns a custom message.

Flask

app.config['MAX_CONTENT_LENGTH'] = [1]

@app.errorhandler([2])
def too_large(e):
    return 'File is too large!', 413

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

A500 * 1024

BRequestEntityTooLarge

CRequestTooLarge

D1024 * 500

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect exception class

Setting size in kilobytes without converting to bytes

Swapping the blanks

The max size is set to 500 KB in bytes (500 * 1024). The error handler uses the RequestEntityTooLarge exception.

5fill in blank

hard

Fill all three blanks to create a Flask app that limits upload size to 3 MB, handles the error, and returns a JSON response.

Flask

from flask import Flask, jsonify
from werkzeug.exceptions import [1]

app = Flask(__name__)
app.config['MAX_CONTENT_LENGTH'] = [2]

@app.errorhandler(RequestEntityTooLarge)
def handle_large_file(e):
    return jsonify({'error': 'File too large'}), [3]

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

ARequestEntityTooLarge

B3 * 1024 * 1024

C413

DRequestTooLarge

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong exception class

Setting size without converting to bytes

Using wrong HTTP status code

The exception imported is RequestEntityTooLarge. The max size is 3 MB in bytes (3 * 1024 * 1024). The HTTP status code for payload too large is 413.