安全地在浏览器中下载具有正确文件名的文件

I am doing some work on a web site that has a secure area which is available to users only after they have logged in. In this area there is a page with links to pdf documents which can be downloaded. The physical documents are outside of the web site's root directory. The links to the pdf documents look something like this:I am doing some work on a web site that has a s