Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/151
@afs Said "(It seems odd that the can't get the setting out of an
HttpClient to feed into a builder.)"
YES. It is _intensely_ annoying. It seems like a massive oversight to me,
but as far as I can tell, it is the case. What's worse, several other classes
that are of not dissimilar character _do_ feature convenient copy/builder ops.
(E.g. `oah.client.config.RequestConfig.copy(RequestConfig)`). I will be
checking out whether they're correcting this for the 5-series. (Under dev now.)
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