Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/151
Sorry, @afs , I'm working on this now but not keeping this conversation up
to date. In fact, my most recent comment I now believe to have been wrong. See
[here](https://hc.apache.org/httpcomponents-client-ga/tutorial/html/fundamentals.html#d5e213)
and also that `HttpClientBuilder` is specifically marked as not thread-safe.
So I stayed with the original move (thread `HttpClient` through the call stack)
and got much more careful about closing resources when done with them. That
solved the problem you found. I _think_ that this PR is ready to go. I say I
_think_ because I've been looking at it a lot yesterday and today, and I'd like
to leave it alone for a day and look at it with fresh eyes. But
comments/criticism welcome immediately!
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