How TCP Packet Fragmentation Silently Broke a Live AI Career App on Cloud Run

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A developer discovered that CareerPilot AI, a six-stage agentic career analysis tool, was crashing in production on Google Cloud Run despite working perfectly in local development. The app used Server-Sent Events to stream real-time reasoning steps to users, culminating in a large 15KB JSON payload as the final output. An initial attempt to fix apparent buffering issues by force-flushing every SSE chunk after each write made the problem significantly worse. Aggressive flushing caused the final JSON payload to be split across arbitrary TCP packet boundaries mid-byte, and the client-side parser — which assumed each incoming chunk was a complete JSON object — threw a SyntaxError on the truncated data. The root cause was a mismatch between SSE chunk delivery assumptions and how Google's Front End proxy handled fragmented TCP packets under real network conditions.

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