Chrome opens with "Data;" with selenium

Specify the protocol you are using, so instead of localhost:3000, use http://localhost:3000. If that doesn't help, see the comment here on the Chromium issue tracker.

Make sure you are using latest release of ChromeDriver (as for now it's 2.28). I had same problem with data:,. By mistake I've downloaded old version and got the issue with specified URL not being opened, just data:,

I was also getting the same issue. I updated ChromeDriver to the latest version and that fixed it.