Server-Sent Events alternative 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]

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

AFlask

Brender_template

CSession

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using lowercase flask instead of Flask

The Flask class is imported from the flask module to create the app.

2fill in blank

medium

Complete the code to create a Flask app instance.

Flask

app = [1](__name__)

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

Asession

Brequest

CFlask

Drender_template

Attempts:

3 left

💡 Hint

Common Mistakes

Using request or session instead of Flask

Forgetting to pass __name__

Creating the Flask app requires calling Flask with __name__.

3fill in blank

hard

Fix the error in the route decorator to define a streaming endpoint.

Flask

@app.route('/stream', [1]=['GET'])

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

Amethod

Bmethods

Croute

Dendpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'method' instead of 'methods'

Using 'route' or 'endpoint' which are incorrect here

The correct keyword argument to specify HTTP methods is 'methods'.

4fill in blank

hard

Fill both blanks to create a generator function that yields messages for streaming.

Flask

def event_stream():
    while True:
        yield [1] + '\n\n'
        time.sleep([2])

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

A'data: Hello World!'

B'event: message'

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Yielding without 'data:' prefix

Using too long or zero sleep time

The generator yields a string starting with 'data:' followed by two newlines, then sleeps 1 second.

5fill in blank

hard

Fill all three blanks to return a streaming response with correct mimetype.

Flask

from flask import Response

@app.route('/stream')
def stream():
    return Response([1](), mimetype=[2])

# Use [3] mimetype for Server-Sent Events

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

Aevent_stream

B'text/event-stream'

C'application/json'

D'text/plain'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong mimetype like 'application/json' or 'text/plain'

Calling the generator without parentheses

The Response uses the event_stream generator and 'text/event-stream' mimetype for SSE.