//okhttp/okhttp3/Authenticator/authenticate

authenticate

[jvm]\ abstract fun authenticate(route: Route?, response: Response): Request?

Returns a request that includes a credential to satisfy an authentication challenge in response. Returns null if the challenge cannot be satisfied.

The route is best effort, it currently may not always be provided even when logically available. It may also not be provided when an authenticator is re-used manually in an application interceptor, such as when implementing client-specific retries.