Nginx X-Accel-Redirect with Rails

nginx.conf

location / {
    client_max_body_size    200m;
    proxy_read_timeout 60;
    proxy_connect_timeout 60;
    proxy_pass http://railsapp;
}

location /bigfiles {
    # -> /path/to/railsroot/bigfiles
    root /path/to/railsroot/;
    internal;
}

production.rb

# Only for Rails3
# config.action_dispatch.x_sendfile_header = 'X-Sendfile'
config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect'

rails2_movie_controller.rb

# Rails2
def download
  path = "/bigfiles/long_movie.mp4"
  response.headers['X-Accel-Redirect'] = path
  response.headers['Content-Type'] = "application/force-download" 
  response.headers['Content-Disposition'] = "attachment; filename=\"#{File.basename(path)}\"" 
  response.headers['Content-length'] = File.size(RAILS_ROOT + path)
  render :nothing => true
end

rails3_movie_controller.rb

# Rails3
def download
  path = "/bigfiles/long_movie.mp4"
  send_file path, 
            :type => "application/force-download",
            :disposition => "attachment; filename=\"#{File.basename(path)}\""
end