objectif

Configurer une session HTTP résiliente avec retries et timeouts.

code minimal

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

def resilient_session(total=3, backoff=0.5, statuses=(500, 502, 503, 504)):
    retry = Retry(total=total, backoff_factor=backoff, status_forcelist=statuses, allowed_methods=["GET","POST","PUT","DELETE","HEAD","OPTIONS"])
    adapter = HTTPAdapter(max_retries=retry, pool_connections=10, pool_maxsize=10)
    s = requests.Session()
    s.mount("http://", adapter)
    s.mount("https://", adapter)
    orig = s.request
    def wrapped(method, url, **kw):
        timeout = kw.pop("timeout", 10)
        return orig(method, url, timeout=timeout, **kw)
    s.request = wrapped
    return s

if __name__ == "__main__":
    sess = resilient_session()
    adapter = sess.get_adapter("https://")
    print(hasattr(adapter, "max_retries"))  # attendu: True

utilisation

import requests
print(isinstance(requests.Session(), requests.Session))

variante(s) utile(s)

s = resilient_session(total=5, backoff=1.0)
print(s.get_adapter("http://").max_retries.total == 5)

notes

• Toujours fixer un timeout; sinon, risque de blocage indéfini.
• Limitez les méthodes retriées (idempotentes de préférence).