Blisk devices are preinstalled inside Blisk browser. Devices are not hosted in the cloud. Devices are a part of Blisk browser emulation module.
It means that Blisk browser devices can work with your local web server. Simply start your local web server and paste the URL in Blisk address bar.
If you work in Visual Studio - set Blisk as your default web browser. Press F5 or CTRL + F5. This will start your local website in Blisk browser automatically.
Due to Blisk devices are hosted on your PC locally, Blisk users are protected from any security issues. You can work with your local web server and preview emulation without installing or downloading any additional software.