Why is the ItemCategory object not populated in Golang\'s GetConfiguration call despite being declared in the mask?

Unable to Get ItemCategory Info from GetConfiguration Call in Golang

Problem:
When calling GET https://api.softlayer.com/rest/v3/SoftLayer_Product_Package/257/getConfiguration?objectMask=mask[itemCategory], the ItemCategory object is populated in REST, but not in Golang, despite declaring it in the mask.

import (
    "github.com/softlayer/softlayer-go/services"
)

// ...

// Object-Mask to get specific Vlan's information
mask := "itemCategory"

// Call to getNetworkVlans in order to retrieve vlans according to filter.
result, err := service.Mask(mask).Id(257).GetConfiguration()
if err != nil {
    fmt.Printf("\n Unable to retrieve config:\n - %s\n", err)
    return
}

Sample output:

{
    "id": 7167,
    "isRequired": 0,
    "itemCategoryId": 390,
    "orderStepId": 1,
    "packageId": 257,
    "sort": 0
}

Solution:

The issue arises because the default endpoint for the SoftLayer API in Go is XMLRPC, which does not support retrieving the ItemCategory object. To rectify this, switch to the REST endpoint by updating the session configuration:

endpoint := "https://api.softlayer.com/rest/v3"

// Create a session
sess := session.New(username, apikey, endpoint)

This should populate the ItemCategory object in the API response as expected.

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