The documentation for the Okta auth method's config endpoint says that base_url has a default of "".
However, the endpoint handler says that "When not specified in the configuration, "okta.com" is used."

I'm not exactly sure how to best represent this in the documentation. On the one hand, the documentation is technically correct: if base_url isn't specified, it will be stored as an empty string. On the other hand, when the value is used to create a client, "okta.com" will be used if base_url is empty.