ERROR - Cannot set verify_mode to CERT_NONE when check_hostname is enabled

[Barsovski]

I'm working with the exchangelib (v5.4) library.
A couple of days ago I noticed that in the Docker container exchangelib started complaining with an error ValueError: Cannot set verify_mode to CERT_NONE when check_hostname is enabled.

Exchangelib tries to connect to a local server with a low security level via a custom adapter with this lines

from requests.adapters import HTTPAdapter


class CustomHttpAdapter(HTTPAdapter):
    """Transport adapter that allows us to use custom ssl_context."""

    def __init__(self, ssl_context=None, **kwargs):
        self.ssl_context = ssl_context
        super().__init__(**kwargs)

    def init_poolmanager(self, connections, maxsize, block=False, **kwargs):
        self.ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
        self.ssl_context.set_ciphers('DEFAULT:@SECLEVEL=0')
        self.ssl_context.check_hostname = False

        self.poolmanager = urllib3.poolmanager.PoolManager(
            num_pools=connections, maxsize=maxsize,
            block=block, ssl_context=self.ssl_context, ssl_version=ssl.PROTOCOL_TLSv1)

With this exchangelib shows an error:

File "/usr/local/lib/python3.11/site-packages/cached_property.py", line 70, in __get__
2024-05-23T11:53:23.558367392Z     return obj_dict[name]
2024-05-23T11:53:23.558368832Z            ~~~~~~~~^^^^^^
2024-05-23T11:53:23.558370213Z KeyError: \'calendar\'

But if I change the version of requests package from 2.32.0 to 2.31.0, connection and information exchange occurs normally.

System Information

{
  "chardet": {
    "version": null
  },
  "charset_normalizer": {
    "version": "3.3.2"
  },
  "cryptography": {
    "version": ""
  },
  "idna": {
    "version": "3.7"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.11.9"
  },
  "platform": {
    "release": "6.5.0-35-generic",
    "system": "Linux"
  },
  "pyOpenSSL": {
    "openssl_version": "",
    "version": null
  },
  "requests": {
    "version": "2.32.0"
  },
  "system_ssl": {
    "version": "300000b0"
  },
  "urllib3": {
    "version": "2.2.1"
  },
  "using_charset_normalizer": true,
  "using_pyopenssl": false
}

[sigmavirus24]

In the future, please search closed and open issues before creating new ones that are duplicates.