The URL for getNodeByDataspaceAndAnchor is :

"v1/dataspaces/{dataspace-name}/anchors/{anchor-name}/nodes"

This URL is described as "Get a node with an option to retrieve all the children for a given anchor and dataspace"

Thus the URL should change to
"v1/dataspaces/{dataspace-name}/anchors/{anchor-name}/node"

Acceptance criteria :
Update Openapi yamls, java method name and Testware.