Code snippets showing different approaches to resolving blocking operations in a FastAPI server.

fastapi-async-vs-non-blocking.py

...
from fastapi.background import BackgroundTasks

...

@app.get("/process-files")
async def process_files(background_tasks: BackgroundTasks):
    logger.info("Before process files")
    background_tasks.add_task(upload_to_s3)
    logger.info("After process files")
    return {"ok": True}