FastAPI Async Mimarisi: Asyncio Event Loop ve Yüksek Eşzamanlılık (Concurrency)

import httpx
from fastapi import FastAPI

app = FastAPI()

# DOĞRU: Asenkron non-blocking HTTP isteği
@app.get("/async-fetch")
async def async_fetch():
    async with httpx.AsyncClient() as client:
        res = await client.get("https://api.example.com/data")
        return res.json()

# DOĞRU: Senkron CPU-heavy veya bloklayıcı işlem (FastAPI threadpool'a atar)
@app.get("/sync-compute")
def sync_compute():
    import time
    time.sleep(1) # Threadpool'da çalışır, Event Loop'u kilitlemez
    return {"status": "ok"}