OpenPrinterOpenPrinter Agent Gateway
Server cancels a job
The server may cancel a queued or locally persisted job before backend submission. The agent may race with submission; once a backend has accepted the job, cancellation is no longer guaranteed.
Address
/.well-known/openprinter/gatewayDescription
The authenticated, bidirectional OPPA gateway socket.
Messages
A best-effort request to stop a job before printer submission. The agent may receive this message at the same time as local processing.
Payload
Message Example
{ "protocolVersion": "1", "messageId": "job_cancel_01", "sentAt": "2026-08-21T00:00:05Z", "type": "server.cancel_job", "payload": { "jobId": "job_01", "reason": "The order was voided." }}