error 429, but requests executes the request correctly

[AndrejedaI]

I'm trying to get a response from a server with a status of 200. The request library handles this, but aiohttp doesn't.
Perhaps the first 5-7 requests will give an answer of 200, but then it will be 429. It’s strange that it’s not clear what this could be connected with.

import asyncio
import aiohttp
import requests


headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:130.0) Gecko/20100101 Firefox/130.0',
    'Accept': '*/*',
    'Accept-Language': 'ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3',
    'Content-Type': 'text/plain;charset=UTF-8',
    'Origin': 'https://app.uniswap.org',
}

data = '{"tokenInChainId":1,"tokenIn":"ETH","tokenOutChainId":1,"tokenOut":"0xe41d2489571d322189246dafa5ebde1f4699f498","amount":"1000000000000000000","sendPortionEnabled":true,"type":"EXACT_INPUT","intent":"quote","configs":[{"useSyntheticQuotes":false,"routingType":"DUTCH_V2"},{"enableUniversalRouter":true,"protocols":["V2","V3","MIXED"],"routingType":"CLASSIC","enableFeeOnTransferFeeFetching":true}],"useUniswapX":true,"slippageTolerance":"0.5"}'


def sync_main():
    for i in range(10):
        s = requests.Session()
        s.headers.update(headers)
        response = s.post('https://interface.gateway.uniswap.org/v2/quote', data=data)
        print("requests ->", response.status_code)


async def async_main():
    for i in range(10):
        async with aiohttp.ClientSession(headers=headers) as session:
            async with session.request("POST",
                                       'https://interface.gateway.uniswap.org/v2/quote',
                                       data=data) as response:
                print("aiohttp ->", response.status)


if __name__ == '__main__':
    asyncio.run(async_main())
    sync_main()

Python 3.12
aiohttp==3.10.6
requests==2.32.3

[webknjaz]

You're being rate-limited: 429 Too Many Requests. Wait between the HTTP requests when you see a Retry-After.

[Dreamsorcerer]

Odd that it'd work with requests though. Do they have some automatic retry or something?
I wouldn't expect a noticeable difference in performance with that (unoptimised) code.

[webknjaz]

I'd assume that requests might be having a longer delay between requests, perhaps. Or maybe, the server sees different headers/TLS mode etc., and applies rate limiting differently.

[AndrejedaI]

I added this header, but unfortunately everything is the same, requests still returns 200, and aiohttp returns 429 after 6-7 requests. How can this happen in theory? I'm far from a professional in this, but this is very strange based on the fact that the resource and headers are the same

[AndrejedaI]

'Retry-After': '5' or is it a matter of delay?

[Dreamsorcerer]

You need to read the headers on the response, not add any...