    # File lib/plugins/tinyurl.rb, line 50
      def self.shorten_url(url, host, format)
        return url if config.plugins.tinyurl.ignore_regexp =~ url # already shorten
        url_enc = URI.escape(url, /[^a-zA-Z0-9.:]/)
        res = Termtter::HTTPpool.start(host) do |h|
          h.get(format % url_enc)
        end
        if res.code == '200'
          result = res.body
          if /"shortUrl": "(http.*?)"/ =~ result
            result = $1
          elsif /"statusCode": "ERROR"/ =~ result
            return nil
          end
          result
        else
          nil
        end
      end