Claude Code Adds SSE Keepalive Pings So Long Thinking Pauses Stop Killing Vertex and Bedrock Sessions
Claude Code Changelog·medium signal
2.1.229 added SSE keepalive pings to gateway streaming responses during long thinking pauses, preventing idle-timeout disconnects on Vertex AI and Bedrock upstreams. Enterprise users routing through those gateways were losing extended-reasoning turns to intermediary timeouts that saw a silent stream as a dead connection. The same release also made expired or missing Google Cloud credentials fail within seconds instead of retrying for minutes.