Format webhook 3xx: Sume does not follow redirects, use the final URL

If your webhook endpoint answers with a redirect, Sume counts the delivery as failed. The delivery docs say redirects are not followed, so a 301, 302 or 308 is not a success and the attempt is retried on the schedule. The usual causes are an HTTP to HTTPS bounce, a www to apex rule, or a trailing slash added by your framework.

The fix is to register the exact URL that answers 2xx on its own, and to check it with a plain request before you create a run.

How do I find the redirect?

Request the URL you registered without following redirects and read the status.

curl -sS -o /dev/null -w '%{http_code} %{redirect_url}\n' \
  -X POST https://example.com/hooks/sume \
  -H 'content-type: application/json' \
  -d '{}'

What does the delivery require?

Sume's Run webhooks page sets the rules; the redirect rule is easy to miss next to them.

What if the run already ended?

Fix the URL, then ask Sume to send the event again with POST /v1/format-runs/{id}/webhook/redeliver. Meanwhile the run's status_url still gives the same result, so a broken endpoint costs you latency, not data.