FastAPI allows you to run background tasks in a way that is easy to test and maintain. This is done using the BackgroundTasks class.
from fastapi import BackgroundTasks
def send_email(email: str):
print(f"Sending email to {email}...")
@app.post("/register/")
def register_user(email: str, background_tasks: BackgroundTasks):
background_tasks.add_task(send_email, email)
return {"message": "User registered, email will be sent."}Executes background tasks without blocking the API request.