한양과학기술고등학교

from contextlib import asynccontextmanager
from fastapi import FastAPI

@asynccontextmanager
async def lifespan(app: FastAPI):
    # ── startup ──
    app.state.http = httpx.AsyncClient()
    app.state.db_pool = await create_pool(settings.database_url)
    yield
    # ── shutdown ──
    await app.state.http.aclose()
    await app.state.db_pool.close()

app = FastAPI(lifespan=lifespan)

from fastapi import Request

@app.get("/proxy")
async def proxy(request: Request):
    r = await request.app.state.http.get("https://api.example.com")
    return r.json()

def get_http(request: Request) -> httpx.AsyncClient:
    return request.app.state.http

HttpDep = Annotated[httpx.AsyncClient, Depends(get_http)]

@app.get("/proxy")
async def proxy(http: HttpDep):
    r = await http.get("https://api.example.com")
    return r.json()

# deprecated — 새 코드는 lifespan 사용
@app.on_event("startup")
async def startup(): ...

@app.on_event("shutdown")
async def shutdown(): ...