Github user ajs6f commented on the issue:
https://github.com/apache/jena/pull/151
Reading through the current HTTP Commons docs leaves me with the impression
that we do not need to close clients after use in `HttpOp`, but that we do need
to see to it that _responses_ are closed. However, tracing through to
`oaj.riot.web.HttpResponseLib.nullResponse` in conjunction with advice
[here](https://hc.apache.org/httpcomponents-client-ga/tutorial/html/fundamentals.html#d5e145)
assures me that we are doing what we need to do. The only case that I find
uncertain is in methods like `TypedInputStream execHttpGet(String url)` wherein
we really cannot be sure that the request is properly closed. I'm not sure what
to do about this short of trying to take `HttpOp` completely internal, which
seems like a massive overreaction.
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