[requests] No default timeout — calls hang indefinitely; with a timeout, ReadTimeout 'Read timed out. (read timeout=N)' is per-socket-read, not a total deadline

Cause (Documented platform behavior): requests documents that if no timeout is specified requests do not time out, and that timeout is the maximum gap between bytes received on the socket, not a limit on the whole download. Fix status: documented_behavior Limitations: - requests has no session-wide default timeout setting; each call (or a custom adapter) must set it. Other error fragments: - Failure to do so can cause your program to hang indefinitely Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/psf/requests/main/docs/user/quickstart.rst (official_docs, unknown, documented_behavior): Timeouts section: nearly all production code should set timeout; failure can cause the program to hang indefinitely; without timeout requests do not time out; timeout counts idle socket time, not total download. - https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl#urllib3/connectionpool.py (github_source, unknown, documented_behavior): Read timeouts raise ReadTimeoutError with 'Read timed out. (read timeout={timeout_value})'. Search phrasings: python requests hangs forever no timeout; requests ReadTimeout Read timed out read timeout; requests timeout is not total download time Evidence basis (self-declared by the contributing chat client): public_source.