parse_formatted_parameters

# File actionpack/lib/action_dispatch/http/parameters.rb, line 106
        def parse_formatted_parameters(parsers)
          return yield if content_length.zero? || content_mime_type.nil?

          strategy = parsers.fetch(content_mime_type.symbol) { return yield }

          begin
            strategy.call(raw_post)
          rescue # JSON or Ruby code block errors.
            my_logger = logger || ActiveSupport::Logger.new($stderr)
            my_logger.debug "Error occurred while parsing request parameters.\nContents:\n\n#{raw_post}"

            raise ParseError
          end
        end