httpx vs aiohttp vs requests

[HuiDBK]

In the FastAPI web framework, why is httpx so much worse than aiohttp when facing high concurrent requests? They both reuse the same client instance.

test code

import uvicorn
from fastapi import FastAPI
import requests
import httpx
import aiohttp

app = FastAPI(description="sync and async route func test")

aio_client = httpx.AsyncClient()
aio_session: aiohttp.ClientSession = None
req_session = requests.Session()


@app.on_event("startup")
async def startup_event():
    global aio_session
    aio_session = aiohttp.ClientSession()


async def async_get(url):
    # async with aio_session.get(url) as resp:
    #     return resp

    resp = await aio_client.get(url)
    return resp


@app.get("/ping")
async def ping():
    return "pong"


@app.get("/async_route_func_demo")
async def async_route_func():
    url = "https://juejin.cn/"
    resp = await async_get(url)
    # print("resp", resp)
    return "async_route_func_demo"


@app.get("/async_route_use_sync_io_demo")
async def async_route_func():
    url = "https://juejin.cn/"
    resp = req_session.get(url)
    # print("resp", resp)
    return "async_route_func_demo"


@app.get("/sync_route_func_demo")
def sync_route_func():
    url = "https://juejin.cn/"
    resp = req_session.get(url)
    # print("resp", resp)
    return "sync_route_func_demo"


def main():
    uvicorn.run(app, log_level="warning")


if __name__ == '__main__':
    main()

wrk test result

python version: Python 3.10.12
operating system: mac os m1 pro

requirements

fastapi==0.101.0
uvicorn==0.23.2
requests==2.32.0
httpx==0.27.0

[MarkusSintonen]

This is related: #3215