# File lib/em-http/http_encoding.rb, line 16
    def unescape(s)
      if defined?(EscapeUtils)
        EscapeUtils.unescape_url(s.to_s)
      else
        s.tr('+', ' ').gsub(/((?:%[0-9a-fA-F]{2})+)/) {
          [$1.delete('%')].pack('H*')
        }
      end
    end