Enabling Cross-Origin Resource Sharing (CORS) on a Virtuoso SPARQL Endpoint What is CORS? CORS enables conventional client-server interactions over a Web of data sources, with embedded elements from multiple sources presented by a single page. Basically, CORS helps traverse the Web from a single original data source. Why enable CORS? Enabling a Virtuoso SPARQL Endpoint to serve the Data Access needs of user agents (e.g., Javascript clients) that are programmed to leverage CORS. How can I enable CORS? You CORS enable a Virtuoso SPARQL endpoint via the following steps: Go to the HTML-based Instance Admin UI (Conductor) at http://{your-instance-hostname}:[port]/conductor. Enter dba credentials. Go to Web Application Server → Virtual Domains & Directories:

Expand Interface for the Default Web Site:

Locate the /sparql Logical Path:

Click Edit:

Enter, for example, * in the Cross-Origin Resource Sharing input field. Optionally you can check the Reject Unintended CORS check-box:

Click Save Changes. Related Virtuoso Tips and Tricks Collection Setting up server-side Cross-Origin Resource Sharing (CORS) with Virtuoso Third-party guide to enabling Cross-Origin Resource Sharing with various servers