high severityFlowise Cloud API prediction endpoint
API POST /prediction to chatflow returns 504 Gateway Time-out after 30-60s for long workflows. Flow completes successfully (visible in Executions tab/Langsmith), but no response received by client (e.g., Postman, backend code). Client sees timeout despite long client-side timeout set.
Root cause
Load balancer/gateway timeout on synchronous HTTP API responses when workflows exceed ~30-60s (e.g., chained agents + LLM taking 5+min). Flow executes fully server-side but client connection drops before result returns. Affects Flowise Cloud primarily.
Flowisetimeoutload-balancerwebsocket504ssequeue-moderediscloud