Starts asynchronous cancellation on a long-running operation. The server makes a best effort to cancel the operation, but success is not guaranteed. If the server doesn't support this method, it returns google.rpc.Code.UNIMPLEMENTED. Clients can use Operations.GetOperation or other methods to check whether the cancellation succeeded or whether the operation completed despite cancellation. On successful cancellation, the operation is not deleted; instead, it becomes an operation with an Operation.error value with a google.rpc.Status.code of 1, corresponding to Code.CANCELLED.
HTTP request
POST https://discoveryengine.googleapis.com/v1alpha/{name=projects/*/locations/*/dataStores/*/branches/*/operations/*}:cancel
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-06-27 UTC."],[[["\u003cp\u003eThis webpage outlines how to initiate the asynchronous cancellation of a long-running operation via an HTTP POST request to a specific URL.\u003c/p\u003e\n"],["\u003cp\u003eThe request requires specifying the operation's resource name in the URL's path parameters and that the request body must be empty.\u003c/p\u003e\n"],["\u003cp\u003eUpon successful cancellation, the operation will have an error code indicating it was cancelled, and the response body will be an empty JSON object.\u003c/p\u003e\n"],["\u003cp\u003eAuthorization for this request requires the \u003ccode\u003ehttps://www.googleapis.com/auth/cloud-platform\u003c/code\u003e OAuth scope.\u003c/p\u003e\n"],["\u003cp\u003eCancelling an operation does not guarantee success, and can be checked via \u003ccode\u003eOperations.GetOperation\u003c/code\u003e method.\u003c/p\u003e\n"]]],[],null,["# Method: projects.locations.dataStores.branches.operations.cancel\n\n- [HTTP request](#body.HTTP_TEMPLATE)\n- [Path parameters](#body.PATH_PARAMETERS)\n- [Request body](#body.request_body)\n- [Response body](#body.response_body)\n- [Authorization scopes](#body.aspect)\n\nStarts asynchronous cancellation on a long-running operation. The server makes a best effort to cancel the operation, but success is not guaranteed. If the server doesn't support this method, it returns `google.rpc.Code.UNIMPLEMENTED`. Clients can use [Operations.GetOperation](/generative-ai-app-builder/docs/reference/rest/v1/projects.operations/get#google.longrunning.Operations.GetOperation) or other methods to check whether the cancellation succeeded or whether the operation completed despite cancellation. On successful cancellation, the operation is not deleted; instead, it becomes an operation with an [Operation.error](/generative-ai-app-builder/docs/reference/rest/Shared.Types/ListOperationsResponse#Operation.FIELDS.error) value with a [google.rpc.Status.code](/generative-ai-app-builder/docs/reference/rest/Shared.Types/ListOperationsResponse#Status.FIELDS.code) of `1`, corresponding to `Code.CANCELLED`.\n\n### HTTP request\n\n`POST https://discoveryengine.googleapis.com/v1alpha/{name=projects/*/locations/*/dataStores/*/branches/*/operations/*}:cancel`\n\nThe URL uses [gRPC Transcoding](https://google.aip.dev/127) syntax.\n\n### Path parameters\n\n### Request body\n\nThe request body must be empty.\n\n### Response body\n\nIf successful, the response body is an empty JSON object.\n\n### Authorization scopes\n\nRequires the following OAuth scope:\n\n- `https://www.googleapis.com/auth/cloud-platform`\n\nFor more information, see the [Authentication Overview](/docs/authentication#authorization-gcp)."]]
