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All of the methods covered so far are used to define workflow steps. context.cancel is different — it allows you to explicitly cancel the current workflow run. 
export const { POST } = serve<{ topic: string }>(async (context) => {
  const payload = context.requestPayload

  const result = await context.run("check if canceled", () => { ... });

  if (result.cancel) {
    await context.cancel() // cancel the workflow run
  }
})
When a workflow run is canceled:
  • It is labeled as canceled (not failed).
  • The configured failureFunction is not triggered.
  • No entries are sent to the dead-letter queue (DLQ).