[Solved] You want to create a Flask app with Flask-SocketIO that supports both HTTP and WebSocket connections. Which code snippet correctly sets this up and runs the app? | Flask

Flask - WebSocket and Real-Time

You want to create a Flask app with Flask-SocketIO that supports both HTTP and WebSocket connections. Which code snippet correctly sets this up and runs the app?

Afrom flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': socketio.run(app, host='0.0.0.0', port=5000)

Bfrom flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO() if __name__ == '__main__': app.run(host='0.0.0.0', port=5000)

Cfrom flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': app.run()

Dfrom flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': socketio.run()

Step-by-Step Solution

Solution:

Step 1: Confirm SocketIO initialization with app
from flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': socketio.run(app, host='0.0.0.0', port=5000) correctly initializes SocketIO with the Flask app instance.
Step 2: Check how the app is run
from flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': socketio.run(app, host='0.0.0.0', port=5000) uses socketio.run(app, host='0.0.0.0', port=5000) which runs the app with WebSocket support and listens on all interfaces at port 5000. Other options either miss passing app to SocketIO, use app.run() which lacks WebSocket support, or call socketio.run() without app.
Final Answer:
from flask import Flask from flask_socketio import SocketIO app = Flask(__name__) socketio = SocketIO(app) if __name__ == '__main__': socketio.run(app, host='0.0.0.0', port=5000) -> Option A
Quick Check:
socketio = SocketIO(app); socketio.run(app, host='0.0.0.0', port=5000) [OK]

Quick Trick: Use socketio.run(app, host, port) to run with WebSocket support [OK]

Common Mistakes:

MISTAKES

Calling app.run() instead of socketio.run() to start app
Not passing app to SocketIO()
Calling socketio.run() without app argument

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More Flask Quizzes

You want to create a Flask app with Flask-SocketIO that supports both HTTP and WebSocket connections. Which code snippet correctly sets this up and runs the app?

Step 1: Confirm SocketIO initialization with app

Step 2: Check how the app is run

Final Answer:

Quick Check:

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