The /rest/api/content<id> 'version' param is not implemented

Summary

Based on our Confluence REST API documentation, to get a piece of information of a content by using this REST call function, there are request query parameters that can be used;status, version and expand.
However, should version parameter is used - HTTP Error 501 (Not Implemented) always gets returned.

<ConfluenceBaseURL>/rest/api/content/720915?version=1

{"statusCode":501}