send_file (ActionController::Streaming)

    # File lib/action_controller/streaming.rb, line 67
          def send_file(path, options = {}) #:doc:
            raise MissingFile, "Cannot read file #{path}" unless File.file?(path) and File.readable?(path)

            options[:length]   ||= File.size(path)
            options[:filename] ||= File.basename(path) unless options[:url_based_filename]
            send_file_headers! options

            @performed_render = false

            if options[:x_sendfile]
              logger.info "Sending #{X_SENDFILE_HEADER} header #{path}" if logger
              head options[:status], X_SENDFILE_HEADER => path
            else
              if options[:stream]
                render :status => options[:status], :text => Proc.new { |response, output|
                  logger.info "Streaming file #{path}" unless logger.nil?
                  len = options[:buffer_size] || 4096
                  File.open(path, 'rb') do |file|
                    while buf = file.read(len)
                      output.write(buf)
                    end
                  end
                }
              else
                logger.info "Sending file #{path}" unless logger.nil?
                File.open(path, 'rb') { |file| render :status => options[:status], :text => file.read }
              end
            end
          end