Default port for http-server is 8080, so you should be able to access it by visiting http://localhost:8080. The link you shared goes to http://localhost/OHIFviewer/ instead
However, I am trying to access it from IIS as well (Since that will be how the production website will be hosted) wherein I have added it as a virtual directory for OHIFViewer and I am not able to access it from IIS hosted path.