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wizardchen
55caeefc3d
To diagnose where latency lives between "user hits send" and "first token appears" we need a single number that can be matched across the browser console and the server log. Add correlated TTFB markers keyed by X-Request-ID: Frontend (streame.ts) * Generate the X-Request-ID once and reuse it for logging. * Log request:start when fetchEventSource is invoked, response:headers when onopen fires, and response:first_answer the first time an SSE payload with response_type === 'answer' arrives. Filtering by event type avoids treating session_title / references / tool_call as the "first token". Backend (session handler) * parseQARequest records the wall-clock entry time and logs TTFB:start with the same X-Request-ID. * qaRequestContext carries receivedAt through to the stream handler. * AgentStreamHandler emits a one-shot TTFB:first_answer_chunk log the first time it observes an AgentFinalAnswerData chunk, so the delta against TTFB:start is the server's request-in → first-token-out budget. The frontend delta minus the backend delta is then attributable to network + gin middleware, which were previously invisible.