Lesson 08 · 11 min
async, background tasks, and lifespan
What to do before startup, after the response, and while waiting on the network.
An async def route runs on the event loop: while it waits on await, the server handles other requests. For HTTP calls from inside, use the async client httpx.AsyncClient. BackgroundTasks runs a function after the response has gone to the client — for an email or a log entry. lifespan is code that runs once at app startup and shutdown: a connection pool, clients, caches.
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