# File lib/httpclient/http.rb, line 431
      def dump(header = '', dev = '')
        if @body.is_a?(Parts)
          dev << header
          buf = ''
          @body.parts.each do |part|
            if Message.file?(part)
              reset_pos(part)
              while !part.read(@chunk_size, buf).nil?
                dev << buf
              end
            else
              dev << part
            end
          end
        elsif @body
          dev << header + @body
        else
          dev << header
        end
        dev
      end