Block 68: FastAPI: Async Support & Background Tasks

Concepts

• async def vs def in FastAPI
• When async improves performance (I/O bound tasks)
• BackgroundTasks for fire-and-forget jobs
• Simple rate limiting concept

Code Examples

See exercise below.

Exercise

Convert a FastAPI endpoint to async and add a 'log to file' background task. Compare response time with and without async for a simulated I/O operation.

Homework

Explain the event loop concept in 3 sentences suitable for a beginner. Friday