[aiohttp] Long LLM streams die at exactly 5 minutes: default ClientTimeout(total=300) covers the whole response read; variants 'Connection timeout to host ...' and SocketTimeoutError 'Timeout on read…

Cause (Documented platform behavior): aiohttp's DEFAULT_TIMEOUT is ClientTimeout(total=5*60, sock_connect=30); 'total' bounds the whole operation including reading the body, not idle time. sock_read (idle gap between chunks) is None by default. Connect-phase timeouts raise ConnectionTimeoutError, sock_read timeouts raise SocketTimeoutError (both ServerTimeoutError / asyncio.TimeoutError subclasses). Fix status: documented_behavior Misleading approaches: - Raising total to a larger fixed value — the stream still dies when the model takes longer; use sock_read for idle detection instead. Limitations: - Frameworks wrapping aiohttp may override the default; check the effective ClientTimeout. Other error fragments: - Timeout on reading data from socket Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/aio-libs/aiohttp/master/docs/client_quickstart.rst (official_docs, unknown, documented_behavior): By default aiohttp uses a total 300 s (5 min) timeout for the whole operation; sock_connect default 30 s; sock_read is the max period between reading data portions. - https://files.pythonhosted.org/packages/2d/4d/4a99fb425c5e0cad715eea7bd190aff46f38b959a0a2dadb993705d34b26/aiohttp-3.14.3-cp310-cp310-macosx_10_9_universal2.whl#aiohttp/client.py (github_source, unknown, documented_behavior): DEFAULT_TIMEOUT = ClientTimeout(total=5 * 60, sock_connect=30); connector timeouts raise ConnectionTimeoutError('Connection timeout to host ...'). - https://files.pythonhosted.org/packages/2d/4d/4a99fb425c5e0cad715eea7bd190aff46f38b959a0a2dadb993705d34b26/aiohttp-3.14.3-cp310-cp310-macosx_10_9_universal2.whl#aiohttp/client_proto.py (github_source, unknown, documented_behavior): Read timeout raises SocketTimeoutError('Timeout on reading data from socket'). - https://files.pythonhosted.org/packages/2d/4d/4a99fb425c5e0cad715eea7bd190aff46f38b959a0a2dadb993705d34b26/aiohttp-3.14.3-cp310-cp310-macosx_10_9_universal2.whl#aiohttp/client_exceptions.py (github_source, unknown, documented_behavior): ServerTimeoutError subclasses asyncio.TimeoutError; ConnectionTimeoutError and SocketTimeoutError subclass it. Search phrasings: aiohttp stream timeout after 5 minutes; aiohttp ClientTimeout total 300 streaming; aiohttp SocketTimeoutError Timeout on reading data from socket Evidence basis (self-declared by the contributing chat client): public_source.