Overview
FastAPI 0.110, released on January 24, 2024, improves lifespan events for application resource management.
Main Features
Lifespan events
The lifespan context manager replaces the old on_startup and on_shutdown events for cleaner resource management.
python
from contextlib import asynccontextmanager
from fastapi import FastAPI
@asynccontextmanager
async def lifespan(app: FastAPI):
# Startup: initialize resources
print('Initializing...')
yield
# Shutdown: release resources
print('Cleaning up...')
app = FastAPI(lifespan=lifespan)
@app.get('/')
async def home():
return {'message': 'Hello'}