API error · HTTP 503

`maintenance`

Down for maintenance

HTTP status	503 Service Unavailable
`code`	`maintenance`
`title`	Down for maintenance
Retry?	Yes, after `Retry-After`

What it means

The API is down for maintenance. Planned maintenance is announced at least 5 business days ahead (§16).

What to do

Retry after Retry-After, with backoff and the same Idempotency-Key.

Example response

Branch on code, never on title or detail. detail varies; quote request_id to support.

HTTP

HTTP/1.1 503 Service Unavailable
Content-Type: application/problem+json

{
  "type": "https://www.underwritinguk.ai/developers/errors/maintenance",
  "title": "Down for maintenance",
  "status": 503,
  "code": "maintenance",
  "detail": "Down for maintenance.",
  "request_id": "7b0b1e5c-2f7e-4a52-9a43-5b0d0f0e9d11"
}

All error codes · Error catalogue in the integration guide (§15) · Error handling and retries (§12.4)