Feature Request Summary: 

When an http action is unsuccessful (e.g. returns 400), I would like to see the response text in the integration logs and not just the code.

Description/Use Cases: 

A ZIS app has multiple http actions. They can sometimes fail due to bad input and the error is caught as follows:

"SampleState": {
  "Type": "Action",
  "ActionName": "zis:sample_integration:action:zendesk.SampleApiCall",
  "Parameters": {
    "token.$": "$.connections.zendesk.access_token",
  },
  "Catch": [{
    "ErrorEquals": ["States.ALL"],
    "ResultPath": "$.failure_response",
    "Next": "Terminator"
  }],
  "ResultPath": "$.success_response",
  "Next": "NextState"
}

"Terminator": {
  "Type": "Fail",
  "Error": "Unexpected Response",
  "Cause": "$.failure_response"
}

Unfortunately, the cause shown in the log is as follows: 

map[Cause:external action failed due to status code: 400 Error:customError]

For troubleshooting, developer has to copy the input from the logs, replicate the indicated action in terminal/postman while carefully filling all the payload placeholders with input data. God forbid if some of it depends on responses to previous states. Eventually a helpful error description explains everything in the response text:

{
   "errors": [
       {
           "id": "0x123",
           "code": "ExternalIDExists",
           "title": "A different external ID is present on the user"
       }
    ]
}

It would be great to have access to this response text and store it in the ResultPath instead of it being overridden by $.Error  and $.Cause objects.

Business impact of limitation or missing feature:

This is crucial to improve and speedup development of ZIS integrations.