FastAPI·FastAPI essentials

Async

Async endpoints handle IO without blocking the event loop.

Intermediate 10 min read Lesson 4 of 150 Challenge included
What you will be able to do
  • Use async def.
  • Await database or HTTP calls.
  • Keep CPU work off the loop.

In plain English

Async endpoints handle IO without blocking the event loop.

  • Use async def.
  • Await database or HTTP calls.
  • Keep CPU work off the loop.
async.pyPython
@app.get('/slow')
async def slow():
    await asyncio.sleep(0.1)
    return {'ok': True}
Your turn

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Easy

Answer from memory: What should you avoid in an async endpoint?

TEXT · starter
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What should you avoid in an async endpoint?

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