    # File lib/ramaze/helper/send_file.rb, line 20
          def send_file(filename, content_type = nil, content_disposition = nil)
            content_type ||= Rack::Mime.mime_type(::File.extname(filename))
            content_disposition ||= File.basename(filename)

            response.body = ::File.open(filename, 'rb')
            response['Content-Length'] = ::File.size(filename).to_s
            response['Content-Type'] = content_type
            response['Content-Disposition'] = content_disposition
            response.status = 200

            throw(:respond, response)
          end