通过Rails 2.3通过Nginx提供大型文件使用x-sendfile

Let's say I have a Rails 2.3.2 application fronted by nginx and served by mongrel in which I need to serve a large static file through Rails (to control access to it). I want the Rails app to delegate the transfer of the file to nginx, to avoid blocking the mongrel instance.Let's say I have a Rails 2.3.2 application fron