https://datatweets.com/courses/fastapi/async-background-streaming/Recent content in Async, Background Work, and Streaming on DATATWEETSHugoenCopyright (c) 2025 DatatweetsSun, 28 Jun 2026 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-1-async-and-concurrency/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-1-async-and-concurrency/FastAPI runs both async def and def endpoints. Learn how the event loop keeps the server busy during I/O waits, why async helps for I/O-bound work, and the simple rule for choosing between async def and def.https://datatweets.com/courses/fastapi/async-background-streaming/lesson-2-background-tasks/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-2-background-tasks/Don’t make callers wait for side-effects. Use BackgroundTasks to run work after the response is sent — sending email, writing audit logs, cleanup — and learn the limits that tell you when to move to a real task queue.https://datatweets.com/courses/fastapi/async-background-streaming/lesson-3-streaming-and-sse/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-3-streaming-and-sse/Stop buffering whole responses. Wrap a generator in StreamingResponse to send chunks as they’re ready, and use Server-Sent Events (text/event-stream) to push live one-way updates to a client.https://datatweets.com/courses/fastapi/async-background-streaming/lesson-4-websockets/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-4-websockets/When request/response isn’t enough, WebSockets give you a persistent two-way channel. Accept a connection, send and receive messages in a loop, handle disconnects, and test it with the TestClient — a gentle intro with a small echo server.https://datatweets.com/courses/fastapi/async-background-streaming/lesson-5-guided-project-streaming-endpoint/Fri, 14 Nov 2025 09:00:00 +0200https://datatweets.com/courses/fastapi/async-background-streaming/lesson-5-guided-project-streaming-endpoint/Stream a long reply word-by-word as it’s produced, the way chat and AI apps do. Build a StreamingResponse over a generator, add realistic per-token delays with an async generator, and verify the stream end to end.