I've spent the last two weeks trying to find the cause of a latency regression in the async client. I've finally located a logic bug I introduced as part of the UDS work that is preventing TCP_NODELAY from being set for async client connections. Between this fix and some of the others (e.g. the bugs in the STRICT and LAX connection pools), I think we should do a maintenance release. I compiled release notes for review:
https://github.com/apache/httpcomponents-core/blob/5.4.x/RELEASE_NOTES.txt
