How to trigger a long-running task from a web service on Render

Render recommends separating public request handling from long-running work by using a web service as a thin ingestion layer and Render Workflows for deferred processing. Web handlers should quickly validate and store incoming payloads, trigger a workflow, and return HTTP 202 Accepted with a task identifier, avoiding timeouts, dropped connections, duplicate webhook deliveries, and work lost during service restarts. Workflow triggers must account for Render API rate limits of 100 task-run requests per minute, using retries with exponential backoff and jitter for 429 responses, while concurrent jobs require database connection pooling. Because task arguments are limited to 4 MB, large payloads should be stored durably in a database and passed to workflows by reference; database uniqueness constraints based on external webhook IDs also prevent duplicate processing. Clients can track work through status endpoints backed by database records or, preferably, receive completion notifications through callback webhooks. Since workflow retries restart tasks from the beginning rather than resuming partial execution, workflow code must be idempotent and designed to safely tolerate repeated runs.

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