# File lib/www/mechanize/form.rb, line 192
      def request_data
        query_params = build_query()
        case @enctype.downcase
        when /^multipart\/form-data/
          boundary = rand_string(20)
          @enctype = "multipart/form-data; boundary=#{boundary}"
          params = []
          query_params.each { |k,v| params << param_to_multipart(k, v) }
          @file_uploads.each { |f| params << file_to_multipart(f) }
          params.collect { |p| "--#{boundary}\r\n#{p}" }.join('') +
            "--#{boundary}--\r\n"
        else
          WWW::Mechanize::Util.build_query_string(query_params)
        end
      end