'How to launch grunt-uncss for password protected URLs

I need to remove unused CSS and I use grunt-uncss for that. It's installed locally on my PC. The website that I want to process is behind the authorization wall - it's a staging version where I need to add login and password. How can I do it? Any built-in features of grunt-css or installing and configuring any special Node.js app?

I don't have an idea what to try here.



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