parse_formatted_parameters

# File actionpack/lib/action_dispatch/middleware/params_parser.rb, line 25
      def parse_formatted_parameters(env)
        request = Request.new(env)

        return false if request.content_length.zero?

        mime_type = content_type_from_legacy_post_data_format_header(env) ||
          request.content_mime_type

        strategy = @parsers[mime_type]

        return false unless strategy

        case strategy
        when Proc
          strategy.call(request.raw_post)
        when :xml_simple, :xml_node
          data = request.deep_munge(Hash.from_xml(request.body.read) || {})
          request.body.rewind if request.body.respond_to?(:rewind)
          data.with_indifferent_access
        when :yaml
          YAML.load(request.raw_post)
        when :json
          data = ActiveSupport::JSON.decode(request.body)
          request.body.rewind if request.body.respond_to?(:rewind)
          data = {:_json => data} unless data.is_a?(Hash)
          request.deep_munge(data).with_indifferent_access
        else
          false
        end
      rescue Exception => e # YAML, XML or Ruby code block errors
        logger(env).debug "Error occurred while parsing request parameters.\nContents:\n\n#{request.raw_post}"

        raise e
      end