Configure automatic retry of failed connections

[joachimBurket]

We have occasionally connection errors with our internal proxy, and could benefit to set the automatic retry of requests's Session (https://requests.readthedocs.io/en/latest/user/advanced/#example-automatic-retries).

Would you be open to add the automatic retry on the request's Session?

# cert_manager/client.py

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

...

class Client:

    def __init__(self, **kwargs):
        ...

        self.__session = requests.Session()

        retries = Retry(
            total=3,
            backoff_factor=0.1,
            allowed_methods={"HEAD", "GET", "POST", "PUT", "PATCH", "DELETE"},
        )
        self.__session.mount('https://', HTTPAdapter(max_retries=retries))

Or eventually to allowing to pass a Session object during the Client creation?