import requests
from requests.adapters import HTTPAdapter
from urllib3.util import Retry

def make_requests_session(retries=3, backoff_factor=0.5, status_forcelist=(429, 500, 502, 503, 504)):
    """
    재시도(backoff)를 적용한 requests.Session 반환
    """
    session = requests.Session()
    retry = Retry(
        total=retries,
        read=retries,
        connect=retries,
        backoff_factor=backoff_factor,
        status_forcelist=status_forcelist,
        allowed_methods=frozenset(["HEAD", "GET", "OPTIONS", "POST"])
    )
    adapter = HTTPAdapter(max_retries=retry)
    session.mount("https://", adapter)
    session.mount("http://", adapter)
    return session