How to call external API from AWS Step Function?

Question

I want to implement a simple sequence of tasks on AWS Step Function. Something like next:

• I can't fire and forget External API, because I need a response from it. So it is a bad idea to wrap it in a lambda function.
• I can't implement the External API task on Lambda Function, because work exceeds lambda limitations.

The best way that I see is the implementation of a call to External API from the task of Step Function. If I understand correctly it is possible to do with Activities and Worker.

I see some Ruby example, but it isn't clear for me. Could anybody suggest me a good tutorial with clear examples of similar implementation?

PS: External API I could wrap in anything on EC2.

Answer 1

Unfortunately you can't call an external API from the Step Function. You have to wrap the call in a Lambda.

AWS documentation:

Step Functions supports the ability to call HTTP endpoints through API Gateway, but does not currently support the ability to call generic HTTP endpoints.