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err:unkey:application:unexpected_error
Something failed on our side, and it isn’t caused by your request. You get HTTP 500. Any endpoint can return it.
Example response

How to fix

  1. Retry once, with backoff, if the request is safe to repeat. Don’t retry in a tight loop.
  2. If it fails again, contact support with the requestId, the endpoint, and a redacted copy of the request.
Last modified on October 6, 2026