private.rb

if Rails.env.development?
  class DisableAssetsLogger
    def initialize(app)
      @app = app
      Rails.application.assets.logger = Logger.new('/dev/null')
    end

    def call(env)
      previous_level = Rails.logger.level
      Rails.logger.level = Logger::ERROR if env['PATH_INFO'].index("/assets/") == 0
      @app.call(env)
    ensure
      Rails.logger.level = previous_level
    end
  end
  Rails.application.config.middleware.insert_before Rails::Rack::Logger, DisableAssetsLogger
  Thread.new do
    sleep 1
    Rails.application.config.action_mailer.default_url_options.merge!({ protocol: 'https', host: 'lvh.me', port: '8443' })
  end
end