Amazon EC2 Auto Scaling
API Reference (API Version 2011-01-01)

Auto Scaling SOAP API

We have deprecated the SOAP API for Auto Scaling. As of December 4, 2017, if you make a SOAP request, you will receive the following response:

Client.InvalidQueryParameter: SOAP is no longer supported

We recommend that you use the Query API for Auto Scaling, the AWS CLI, or one of the AWS SDKs. For more information, see Accessing Auto Scaling in the Amazon EC2 Auto Scaling User Guide.