使用javascript通过浏览器身份验证下载PDF

I understand that I can do browser authentication with Javascript, and then grab, say, an XML file with that javascript. My use case is a bit different though: There's a link on a webpage to a PDF on a different server. That server does browser authentication. The username and password are NOT secrets, in fact right now, we publish the link like this:I understand that I can do browser authenticati