How can I specify method and path for calling lambda function from step function?

Question

I'd like to call lambda function using a state machine with passing path and method (as in usual HTTP sense). Current serverless template to achieve that is the following:

functions:
  myfunction:
    handler: bin/myfunction
    events:
      - http:
          path: setup
          method: POST

stepFunctions:
  validate: true
  stateMachines:
    myMachine:
      name: myMachine
      definition:
        StartAt: Setup
        States:
          Setup:
            Type: Task
            Resource:
              Fn::GetAtt: [myfunction, Arn]
            Parameters:
              InvocationType: Event
              Payload:
                path: "/setup"
                httpMethod: "POST"
                body: ""
            End: true

However, the actual call that arrives to myfunction is a GET request with path /. Fields that I used as a payload are from lambda:InvokeFunction API where one can set body, path and httpMethod as a json in Payload property of lambda.InvokeInput and get everything called correctly.

How to replicate the same with my example?

Answer 1

path and httpMethod are for invoking an API Gateway route, not a Lambda function.

A Lambda function invocation (mostly) takes a function name, invocation type & a payload.

If you must go via API Gateway, take a look at the official 'Call API Gateway with Step Functions' guide on how to do this otherwise just invoke your Lambda manually.