AI chat stream resumption: when Redis is enough, and when you need durable sessions
Blog post from Ably
AI chat streams often rely on HTTP streaming and Server-Sent Events (SSE), which lack built-in session recovery, necessitating additional infrastructure for reliable resumption. The Vercel AI SDK offers a solution with its resumable streams feature, utilizing Redis to buffer tokens for page-reload recovery, but it is limited to single-device use and requires additional operational responsibilities. This approach is suitable for stable desktop connections with short responses, but becomes less feasible for complex scenarios involving long queries, multiple devices, or enterprise environments. In contrast, Ably AI Transport provides a more robust alternative, offering durable sessions that maintain the complete state of conversations independently of connections, enabling seamless multi-device continuity and overcoming the limitations associated with Redis-backed setups. The choice between these options depends on the specific UX needs, infrastructure capabilities, and the complexity of the AI support product in question.
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