Increasingly, for a variety of reasons, Web sites and Data Spaces will constrain access to resources (documents) based on the identity of a user agent. This feature enables you control how your instance of the Virtuoso Sponger is identified, distinct from other instances.
In order to configure the HTTP client's user agent string, one should set the ClientIdString? parameter in the Virtuoso INI file:
... [HTTPServer] ClientIdString = xx ...