download.rb

def download
      content = Zoid::Content.new
      content.write(resource.file.read)
      res.body = content
      res.body.close
      serve
      throw :halt
    end

    def download
      res.headers.content_type = resource.type
      res.body.total_size = resource.file.size
      serve
      io = resource.file
      until io.eof? do
        begin
          Fiber.yield (res.body << io.read_nonblock(4096))
        rescue IO::WaitReadable
          IO.select([io])
          retry
        end
      end
      res.body.close
    end