StartLaunch - CloudWatch Evidently


Starts an existing launch. To create a launch, use CreateLaunch.

Request Syntax

POST /projects/project/launches/launch/start HTTP/1.1

URI Request Parameters

The request uses the following URI parameters.


The name of the launch to start.

Length Constraints: Minimum length of 1. Maximum length of 127.

Pattern: ^[-a-zA-Z0-9._]*$

Required: Yes


The name or ARN of the project that contains the launch to start.

Length Constraints: Minimum length of 0. Maximum length of 2048.

Pattern: (^[a-zA-Z0-9._-]*$)|(arn:[^:]*:[^:]*:[^:]*:[^:]*:project/[a-zA-Z0-9._-]*)

Required: Yes

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 Content-type: application/json { "launch": { "arn": "string", "createdTime": number, "description": "string", "execution": { "endedTime": number, "startedTime": number }, "groups": [ { "description": "string", "featureVariations": { "string" : "string" }, "name": "string" } ], "lastUpdatedTime": number, "metricMonitors": [ { "metricDefinition": { "entityIdKey": "string", "eventPattern": "string", "name": "string", "unitLabel": "string", "valueKey": "string" } } ], "name": "string", "project": "string", "randomizationSalt": "string", "scheduledSplitsDefinition": { "steps": [ { "groupWeights": { "string" : number }, "segmentOverrides": [ { "evaluationOrder": number, "segment": "string", "weights": { "string" : number } } ], "startTime": number } ] }, "status": "string", "statusReason": "string", "tags": { "string" : "string" }, "type": "string" } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


A structure that contains information about the launch that was started.

Type: Launch object


For information about the errors that are common to all actions, see Common Errors.


You do not have sufficient permissions to perform this action.

HTTP Status Code: 403


A resource was in an inconsistent state during an update or a deletion.

HTTP Status Code: 409


The request references a resource that does not exist.

HTTP Status Code: 404


The request would cause a service quota to be exceeded.

HTTP Status Code: 402


The request was denied because of request throttling. Retry the request.

HTTP Status Code: 429


The value of a parameter in the request caused an error.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: