Github user ok2c commented on the issue:
https://github.com/apache/httpcomponents-core/pull/49
If you expect the caller to mutate the HttpResponse instance you might want
to create a copy of it using `ExecSupport#copy` prior to returning the caller.
You might need a custom `AsyncResponseConsumer`.
Please consider closing the PR if you no longer want `HeaderGroup` to be
thread-safe.
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