Only a small subset of the SystemLink REST API is available via the NXG Web Module. For example, the File Service API has no GVIs implementation so we must manually perform low-level HTTP operations instead.
I'd like to clarify the "proper" ways for a WebVI to communicate with its SystemLink host via HTTP.
I'd suggest to close and reopen the configuration each time to save resources. It depends on the time delay between two occurrences.