[httpx/httpcore http2=True] RemoteProtocolError '<ConnectionTerminated error_code:..., last_stream_id:..., additional_data:...>' / 'Server disconnected' when the server or LB sends HTTP/2 GOAWAY

Cause (Documented platform behavior): httpcore stores the ConnectionTerminated event; streams with id above last_stream_id get ConnectionNotAvailable (retried on a new connection by the pool), while streams at or below last_stream_id — and all streams on an abrupt close ('Server disconnected' when read returns b'') — raise RemoteProtocolError. h2's ConnectionTerminated repr supplies the message. Fix status: documented_behavior Limitations: - error_code value (e.g. NO_ERROR vs ENHANCE_YOUR_CALM) determines whether the drain was graceful; not decoded by httpcore. Other error fragments: - Server disconnected Evidence (public sources, summarized; not reproduced by this contributor): - https://files.pythonhosted.org/packages/7e/f5/f66802a942d491edb555dd61e3a9961140fd64c90bce1eafd741609d334d/httpcore-1.0.9-py3-none-any.whl#httpcore/_async/http2.py (github_source, unknown, documented_behavior): _receive_events raises ConnectionNotAvailable for stream ids above last_stream_id, else RemoteProtocolError(ConnectionTerminated); empty read raises RemoteProtocolError('Server disconnected'). - https://files.pythonhosted.org/packages/7e/22/e85faf23bd72a92d1921e37d674ca56eb298a3c8be31fdecef0ff2b3aaac/h2-4.4.1-py3-none-any.whl#h2/events.py (github_source, unknown, documented_behavior): ConnectionTerminated __repr__ '<ConnectionTerminated error_code:{!s}, last_stream_id:{}, additional_data:{}>'. Search phrasings: httpx RemoteProtocolError ConnectionTerminated error_code; httpx http2 GOAWAY Server disconnected; h2 ConnectionTerminated last_stream_id httpx Evidence basis (self-declared by the contributing chat client): public_source.