Browsersync with Windows Authentication
This should work. The middleware part will pass the relevant headers from the original request to IIS.
browserSync.init({ proxy: { target: 'http://localhost:4300', reqHeaders: { "accept-encoding": "identity", "agent": false }, middleware: function (req, res, next) { if (req.headers.x-logon-user) { res.setHeader("X-Logon-User", req.headers.x-logon-user); } if (req.headers.authorization) { res.setHeader("Authorization", req.headers.authorization); } next(); } }});