Need help creating RestRequest to using token/sessionID agains vCenter 6.5 RestAPI

I am trying to test out the VCSA 6.5 Backup script with vRO available out there. Tested working using Curl, PowerShell, PowerShell using Invoke-RestMethod but can't get it to fully work in vRo. The problem I am having is authenticating using the session ID.

Part 1 - Obtain session ID using SSO Credentials:

Wth Curl: (Works)

curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' --header 'vmware-use-header-authn: test' --header 'vmware-api-session-id: null' -u 'administrator@vsphere.local' -p 'Passw0rd!' 'https://10.158.47.99/rest/com/vmware/cis/session' --insecure

With PowerShell: (Works)

$Server = '10.158.47.99'

$Url = "https://${server}/rest/com/vmware/cis/session"

$secpasswd = ConvertTo-SecureString "Passw0rd!" -AsPlainText -Force

$creds = New-Object System.Management.Automation.PSCredential ("administrator@vsphere.local", $secpasswd)

#Invoke-RestMethod -Method POST -Uri $Url -Header @{ "X-ApiKey" = $apiKey }

$resp = Invoke-RestMethod -Method POST -Uri $Url -Credential $creds

$sessionID = $resp.Value

Write-Host "Session Requested -- $sessionID"

With VRO: (Works)

var requestType = "POST";

var operationUrl = "https://10.158.47.99/rest/com/vmware/cis/session"

var req = restHost.createRequest(requestType, operationUrl, "");

var resp;

resp = req.executeWithCredentials(ssoUser, ssoPassword);

var sessionid = JSON.parse(resp.contentAsString).value;

System.log("New Session id is :   " + sessionid);

Part 2 - Use Obtained sessionID to call https://vc/rest/appliance/recovery/backup/parts and get "backup parts information"

With Curl: (Works)

curl -sik -H 'Accept:application/json' -H "vmware-api-session-id:2b26afc12cd4b374d998e2d63b3b9573" -X GET https://10.158.47.99/rest/appliance/recovery/backup/parts

With PowerShell: (Works)

$headers = @{}

$headers.Add("Accept","application/json")

$headers.Add("vmware-api-session-id", $sessionID)

#$headers.Add("Authorization", "Basic $sessionID")

$Url = "https://${server}/rest/appliance/recovery/backup/parts"

$PartResponse = Invoke-RestMethod -Method GET -Headers $headers -Uri $Url

$PartResponse.value

With VRO: (Not Working)

var request = restHost.createRequest("GET", "https://10.158.47.99/rest/appliance/recovery/backup/parts", "");

request.setHeader("Accept", "application/json");

request.setHeader("vmware-api-session-id", sessionid);

System.log("fullurl -- " + request.fullUrl);

System.log("content-type  -- " +request.contentType);

System.log("getMethod  -- " +request.getMethod());

var resp2 = request.execute();

System.log("get parts list response code: " + resp2.statusCode);

System.log("get parts list response body: " + resp2.contentAsString);

VRO Log::

[2017-09-13 16:55:47.711] [I] New Session id is :   aab84e24f33916b86b90a7bae6991360

[2017-09-13 16:55:47.713] [I] fullurl -- https://10.158.47.99/rest/appliance/recovery/backup/parts

[2017-09-13 16:55:47.714] [I] content-type  -- null

[2017-09-13 16:55:47.715] [I] getMethod  -- GET

[2017-09-13 16:55:47.908] [I] get parts list response code: 403

[2017-09-13 16:55:47.909] [I] get parts list response body: {"type":"com.vmware.vapi.std.errors.unauthorized","value":{"messages":[{"args":[],"default_message":"Unable to authorize user","id":"vapi.security.authorization.invalid"}]}}

Code I am testing - contains code for backup part list but does not work: http://vmwarebits.com/vcenterbackup

Original Source Code - works but no backup part list:  how to authenticate for rest api with vCenter 6.5 appliance

Anyone know what I am doing wrong???

The VRO code seems to be a directly translation of the Curl and PowerShell Script......