FastAPI Background Tasks Not Executing as Expected with Long-Running Processes
I'm currently working on a FastAPI application that utilizes background tasks for handling long-running processes. However, I'm experiencing unexpected behavior where the background tasks do not seem to execute properly, especially when they involve external API calls. I have the following setup: ```python from fastapi import FastAPI, BackgroundTasks import httpx app = FastAPI() async def send_email(email: str): async with httpx.AsyncClient() as client: response = await client.post('https://example.com/send', json={'email': email}) print('Email sent:', response.status_code) @app.post("/send-email/") async def send_email_endpoint(email: str, background_tasks: BackgroundTasks): background_tasks.add_task(send_email, email) return {'message': 'Email will be sent'} ``` When I call the `/send-email/` endpoint, it returns the response instantly as expected, but I'm not seeing any emails being sent after that. I even added logging inside the `send_email` function, but it never seems to get triggered. The FastAPI version I'm using is 0.68.0 and I'm running it with `uvicorn` using the command: ```bash uvicorn main:app --reload ``` I also tried running the server without `--reload`, but the issue persists. Additionally, my application is hosted using Docker, and I have checked that the network settings allow outbound connections. Could this possibly be related to how FastAPI handles the lifecycle of background tasks, or am I missing something fundamental? Any insights would be greatly appreciated!