Github user afs commented on the issue: https://github.com/apache/jena/pull/151 @rvesse so the proposal is operations that take a `HttpClient` and operations that take an `HttpClientBuilder` and `HttpAuthenticator`? (It seems odd that the can't get the setting out of an `HttpClient` to feed into a builder.) `HttpAuthenticator.apply` takes a `HttpClientBuilder`. That would work for me. We have to change the existing design because `HttpClient` is now immutable.
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