Dataikuapi is not correctly honoring "DKU_NO_CHECK_CERTIFICATE" in requests

In theory, Dataiku supports using self-signed certificates by setting e.g. using an environmental variable DKU_NO_CHECK_CERTIFICATE or by setting no_check_certificate=True in the set_remote function call of the non-open source dataiku package.

However, this parameter is not passed to the api_client(), which causes requests to fail which are made to Dataiku instances using self-signed certificates. It is possible to mitigate this by setting the verify value of the internal Session object to false:

client = dataiku.api_client()
client._session.verify = False

Which is not obvious and requires looking through the internals of the package.

A fix at the central call site of the dataikuapi package, _perform_http:
https://github.com/dataiku/dataiku-api-client-python/blob/fc51e29a12a1f50717771522e1b450ae91ff4d87/dataikuapi/dssclient.py#L1228-L1233
would only be possible in parts by duplicating the logic to check the "DKU_NO_CHECK_CERTIFICATE" variable or config files, but would still fail for Dataiku session set up by using the set_remote_dss function call.

The best option would be to add a "no_check_certificate" parameter to the DSSClient class that can be set when creating an instance of the class. But as the DSSClient is also used by the closed-source dataiku package, it seems to me that this can't be solved by contributing to the open source dataikuapi package.

まず dataikuapi/dssclient.py の DSSClient と _perform_http を読み、次に api_client() と set_remote_dss() を通じてセッションがどのように作成されるかを追跡します。closed-source の dataiku パッケージに依存せずに証明書検証設定を伝播できるかどうかを確認します。自己署名証明書を使用する場合に、requests が DKU_NO_CHECK_CERTIFICATE と設定された no_check_certificate の値を尊重すれば完了です。