StopLaunch - CloudWatch Evidently


Stops a launch that is currently running. After you stop a launch, you will not be able to resume it or restart it. Also, it will not be evaluated as a rule for traffic allocation, and the traffic that was allocated to the launch will instead be available to the feature's experiment, if there is one. Otherwise, all traffic will be served the default variation after the launch is stopped.

Request Syntax

POST /projects/project/launches/launch/cancel HTTP/1.1 Content-type: application/json { "desiredState": "string", "reason": "string" }

URI Request Parameters

The request uses the following URI parameters.


The name of the launch to stop.

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 that you want to stop.

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 accepts the following data in JSON format.


Specify whether to consider the launch as COMPLETED or CANCELLED after it stops.

Type: String


Required: No


A string that describes why you are stopping the launch.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 160.

Pattern: .*

Required: No

Response Syntax

HTTP/1.1 200 Content-type: application/json { "endedTime": number }

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.


The date and time that the launch stopped.

Type: Timestamp


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


The request references a resource that does not exist.

HTTP Status Code: 404


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: