FastAPI Background Task Not Triggering After Response in Python 3.10
I've searched everywhere and can't find a clear answer... I'm following best practices but I'm prototyping a solution and I'm trying to figure out I'm a bit lost with After trying multiple solutions online, I still can't figure this out... I'm working on a project and hit a roadblock. I'm running into an scenario with FastAPI where I expect a background task to execute after returning a response, but it seems like it's not triggering at all. I've set up a simple FastAPI application and defined a background task that should send an email after an endpoint is called. However, the task doesn't seem to run, and I don't see any errors in the logs. Here's a minimal example of my code: ```python from fastapi import FastAPI, BackgroundTasks import time app = FastAPI() def send_email(email: str): time.sleep(5) # Simulating a delay for sending an email print(f"Email sent to {email}") @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 hit the endpoint with a POST request, I get the response immediately, which is expected, but the email is never sent. I've tried adding logging inside the `send_email` function and it doesn't trigger at all. I've confirmed that the FastAPI version is 0.68.0 and I'm running it with uvicorn. The scenario continues regardless of the email address I provide, and I wonder if there might be something wrong with how I'm using `BackgroundTasks` or if there's a specific configuration in uvicorn I might be missing. Can anyone guide to understand why the background task isn't being executed? Any insights would be greatly appreciated! For context: I'm using Python on Ubuntu. Thanks in advance! Am I missing something obvious? My team is using Python for this microservice. For reference, this is a production application. Thanks, I really appreciate it! I'm working on a mobile app that needs to handle this. Thanks, I really appreciate it! I recently upgraded to Python 3.9. Cheers for any assistance!