fast_api_async.py

import time
import asyncio
from fastapi import FastAPI

app = FastAPI()

# 1/ Request resolved in 5.03s
# 2/ Request resolved in ~10s
@app.get("/not_async")
def not_async():
    time.sleep(5) # Long call to a DB or something else
    return {"message": "Hello World"}


# 1/ Request resolved in 5.01s
# 2/ Request resolved in 5.02s
@app.get("/async")
async def async_endpoint():
    await asyncio.sleep(5) # Long call to a DB or something else
    return {"message": "Hello World"}