There is a discrepancy:
There is a ESRI REST API request
https://somename.portal.spatial.nsw.gov.au/server/rest/services/someservice/FeatureServer/5
that returns different results
1 - The ESRI REST API in browser Google Chrome returns:
HasZ: true
2 - The REST API in the C# code using HTTPClient returns:
"hasZ":false
Regards,
Mark