# File lib/www/mechanize/util.rb, line 5
        def build_query_string(parameters)
          parameters.map { |k,v|
            k &&
              [WEBrick::HTTPUtils.escape_form(k.to_s),
                WEBrick::HTTPUtils.escape_form(v.to_s)].join("=")
          }.compact.join('&')
        end