parse_formatted_request_parameters

# File actionpack/lib/action_controller/request.rb, line 491
      def parse_formatted_request_parameters
        return {} if content_length.zero?

        content_type, boundary = self.class.extract_multipart_boundary(content_type_with_parameters)

        # Don't parse params for unknown requests.
        return {} if content_type.blank?

        mime_type = Mime::Type.lookup(content_type)
        strategy = ActionController::Base.param_parsers[mime_type]

        # Only multipart form parsing expects a stream.
        body = (strategy && strategy != :multipart_form) ? raw_post : self.body

        case strategy
          when Proc
            strategy.call(body)
          when :url_encoded_form
            self.class.clean_up_ajax_request_body! body
            self.class.parse_query_parameters(body)
          when :multipart_form
            self.class.parse_multipart_form_parameters(body, boundary, content_length, env)
          when :xml_simple, :xml_node
            body.blank? ? {} : Hash.from_xml(body).with_indifferent_access
          when :yaml
            YAML.load(body)
          when :json
            if body.blank?
              {}
            else
              data = ActiveSupport::JSON.decode(body)
              data = {:_json => data} unless data.is_a?(Hash)
              data.with_indifferent_access
            end
          else
            {}
        end
      rescue Exception => e # YAML, XML or Ruby code block errors
        raise
        { "body" => body,
          "content_type" => content_type_with_parameters,
          "content_length" => content_length,
          "exception" => "#{e.message} (#{e.class})",
          "backtrace" => e.backtrace }
      end