Health check endpoints in Flask - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a health check endpoint in a Flask application?

A health check endpoint is a simple URL route that returns a status indicating if the Flask app is running properly. It helps monitoring tools know if the app is healthy.

beginner

How do you create a basic health check endpoint in Flask?

You define a route like @app.route('/health') and return a simple response like {'status': 'ok'} with HTTP status 200.

intermediate

Why should health check endpoints be lightweight and fast?

Because they are called frequently by monitoring systems to quickly verify app status without adding load or delays to the app.

beginner

What HTTP status code is commonly returned by a healthy Flask health check endpoint?

HTTP status code 200 means the app is healthy and responding correctly.

intermediate

How can you extend a health check endpoint to check database connectivity in Flask?

Inside the health check route, add a quick query or ping to the database. If it succeeds, return healthy; if it fails, return an error status.

What is the main purpose of a health check endpoint in Flask?

A To verify the app is running and responsive

B To serve the main homepage

C To handle user login

D To store user data

Health check endpoints are designed to confirm the app is up and running.

Which HTTP status code usually indicates a healthy Flask app in a health check?

A 404

B 500

C 200

D 302

Status code 200 means OK, indicating the app is healthy.

What should a health check endpoint avoid doing?

A Performing heavy computations

B Responding quickly

C Returning a simple status

D Being accessible via a URL

Health checks should be lightweight and fast, avoiding heavy tasks.

How can you test database connectivity in a Flask health check?

A By checking user sessions

B By restarting the database

C By ignoring the database

D By running a quick database query

A quick query or ping confirms the database is reachable.

Where do you define a health check endpoint in Flask?

A In the database schema

B In a route decorated with @app.route

C In the HTML templates

D In the CSS files

Flask endpoints are defined with @app.route decorators.

Explain how to create a simple health check endpoint in Flask and why it is useful.

Think about a URL that tells if your app is alive.

Describe how you would enhance a Flask health check endpoint to verify database connectivity.

Check if the app can talk to its database quickly.