class method self.parse_query_parameters

# File actionpack/lib/action_controller/request.rb, line 550
      def parse_query_parameters(query_string)
        return {} if query_string.blank?

        pairs = query_string.split('&').collect do |chunk|
          next if chunk.empty?
          key, value = chunk.split('=', 2)
          next if key.empty?
          value = value.nil? ? nil : CGI.unescape(value)
          [ CGI.unescape(key), value ]
        end.compact

        UrlEncodedPairParser.new(pairs).result
      end