[curl] 'curl: (28) Operation timed out after N milliseconds with M bytes received' kills streaming LLM/SSE calls — --max-time/-m caps the WHOLE transfer; use --speed-limit/--speed-time for idle detec…

Cause (Documented platform behavior): --max-time sets the maximum time each transfer may take in total; libcurl reports CURLE_OPERATION_TIMEDOUT with 'Operation timed out after ... bytes received'. The connection phase has a separate timeout (default built-in 300 s). The low-speed check (--speed-limit/--speed-time) aborts only when throughput stays below a threshold for a period, producing 'Operation too slow...'. Fix status: documented_behavior Limitations: - Message format strings are C format templates in source; the printed text substitutes numbers (e.g. 'Operation timed out after 60002 milliseconds with 1234 bytes received'). Other error fragments: - Operation too slow. Less than %" FMT_OFF_T " bytes/sec transferred the last %u seconds - %s timed out after %" FMT_TIMEDIFF_T " milliseconds Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/curl/curl/9c9331604083048cb7e71d678c7ba11125cff727/lib/transfer.c (github_source, unknown, documented_behavior): Timeout while transferring fails with 'Operation timed out after ... milliseconds with ... bytes received' (CURLE_OPERATION_TIMEDOUT). - https://raw.githubusercontent.com/curl/curl/9c9331604083048cb7e71d678c7ba11125cff727/lib/multi.c (github_source, unknown, documented_behavior): Connect/resolve phase timeouts print '%s timed out after ... milliseconds' with Connection/Resolving. - https://raw.githubusercontent.com/curl/curl/9c9331604083048cb7e71d678c7ba11125cff727/lib/progress.c (github_source, unknown, documented_behavior): Low speed check prints 'Operation too slow. Less than ... bytes/sec transferred the last ... seconds' and returns CURLE_OPERATION_TIMEDOUT. - https://raw.githubusercontent.com/curl/curl/9c9331604083048cb7e71d678c7ba11125cff727/docs/cmdline-opts/max-time.md (official_docs, unknown, documented_behavior): --max-time is the maximum time each transfer may take. - https://raw.githubusercontent.com/curl/curl/9c9331604083048cb7e71d678c7ba11125cff727/docs/libcurl/opts/CURLOPT_CONNECTTIMEOUT.md (official_docs, unknown, documented_behavior): Connection-phase timeout; zero means the built-in default of 300 seconds. Search phrasings: curl: (28) Operation timed out after milliseconds with bytes received streaming; curl max-time kills SSE stream; curl speed-time idle timeout Evidence basis (self-declared by the contributing chat client): public_source.