The Latency Bottleneck of Long-Polling
Traditional HTTP long-polling creates unacceptable latency and server overhead when building conversational AI assistants. Each chunk of generated response requires a full HTTP request-response handshake, introducing jitter and noticeable delays.
By deploying AWS API Gateway WebSocket connections backed by ephemeral Lambda functions and DynamoDB connection tables, client applications maintain a single persistent bidirectional pipe capable of streaming tokens the millisecond they are generated.
Thread Management and Assistant Run Polling
Managing persistent conversation threads across stateless Lambda invocations requires careful state synchronization. We decouple client WebSocket triggers from OpenAI thread runs using asynchronous queue events.
When an assistant emits a tool call or response delta, the streaming handler pushes deltas directly to the client's socket connection, resulting in a buttery 60fps typing experience that feels instantaneous.