start_processing

# File actionpack/lib/action_controller/log_subscriber.rb, line 9
    def start_processing(event)
      return unless logger.info?

      payload = event.payload
      params = {}
      payload[:params].each_pair do |k, v|
        params[k] = v unless INTERNAL_PARAMS.include?(k)
      end
      format  = payload[:format]
      format  = format.to_s.upcase if format.is_a?(Symbol)
      format  = "*/*" if format.nil?

      info "Processing by #{payload[:controller]}##{payload[:action]} as #{format}"
      info "  Parameters: #{params.inspect}" unless params.empty?
    end