Health check endpoints in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a health check endpoint in a web application?

A health check endpoint is a simple URL in a web app that returns a status showing if the app is running well. It helps monitoring tools know if the app is healthy.

beginner

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

You create a route with @app.get('/health') that returns a simple JSON like {'status': 'ok'}. This shows the app is running.

intermediate

Why should health check endpoints be lightweight and fast?

Because they are called often by monitoring systems. If they take too long or use many resources, they can slow down the app or give wrong health info.

beginner

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

HTTP 200 OK is returned to show the app is healthy and working as expected.

intermediate

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

Inside the endpoint function, try a simple database query or connection test. If it works, return status ok; if it fails, return an error status and message.

What is the main purpose of a health check endpoint?

A To serve the main webpage

B To handle user login

C To update the database

D To show if the app is running properly

Health check endpoints are designed to report the app's running status to monitoring tools.

Which HTTP method is usually used for health check endpoints in FastAPI?

A PUT

B POST

C GET

D DELETE

GET is used because health checks only retrieve status information without changing data.

What should a simple health check endpoint return to indicate success?

A HTTP 404 not found

B HTTP 200 OK with status 'ok'

C HTTP 500 error

D HTTP 403 forbidden

HTTP 200 OK with a status message like 'ok' signals the app is healthy.

Why avoid heavy operations in health check endpoints?

A They slow down the app and can cause false health reports

B They improve app security

C They help with user authentication

D They increase database size

Heavy operations can delay responses and mislead monitoring systems about app health.

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

A Run a simple query and catch errors

B Restart the database server

C Delete all database records

D Ignore database status

Running a simple query helps confirm the database is reachable and working.

Explain how to create a basic health check endpoint in FastAPI and why it is useful.

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

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

Imagine checking if your app can talk to its database before saying it is healthy.