OPDC API error code

HOST_UPGRADE_REQUIRED

HTTP status 503

The company's on-premise agent speaks a protocol version older than this API supports. 503, retryable once the agent is upgraded. The detail names the minimum version. Nothing was sent.

The API answers with a problem document (RFC 9457) whose type is https://twinn.engineering/errors/host-upgrade-required, and with X-Error-Code: HOST_UPGRADE_REQUIRED. Branch on the code, never on the detail text.

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