The ASYRRESTCLI function only accepts JSON as input and will only output data in JSON.

The XML setting on the REST definition indicates the data exchange format to be used by the Syracuse HTTP Bundle ("@sage\syracuse-lib\src\http\client\httpApi.jsc"). 

Thank you. Any thoughts on a work around? This particular external API is exclusively XML payloads. 

I found some documentation around building a 4GL accessible extension in javascript and deploying it in the node.js webserver.  If this worked i could use a standard XMLHttpRequest() in javascript to call the the API and then call the JS function in 4G. Should work in theory.  Documentation is a bit dated though (v7).

What is the return value in RESHEAD if you pass in the payload as JSON (not just the values of "{}", but rather the XML in JSON format)? The purpose of the XML setting on the REST definition is such that Syracuse will convert the JSON to XML on the REST call. I would recommend changing the following logging elements in the Global settings to "Silly":

• REST
• HTTP out
• HTTP in

This will give you the exact context calls made to the external REST service by Syracuse and you can determine if this standard REST service will be able to work for you or not. 

thank you, that helps to clarify. by chance, do you know how to structure the ASYRRESTCLI json payload in such a way that Syracuse would output the XML with the xmlns namespace and this tag attribute as follows: 

<tns2:RatingRequest xmlns:tns2='schemas.3gtms.com/.../rating'>
      ...
      <GrossWeight UOM='Lb'>2650</GrossWeight>
      ...
</tns2:RatingRequest>

if i can figure this out i think it will work.