rack_server_suggestion

# File railties/lib/rails/commands/server/server_command.rb, line 255
        def rack_server_suggestion(server)
          if server.in?(RACK_SERVERS)
            <<~MSG
              Could not load server "#{server}". Maybe you need to the add it to the Gemfile?

                gem "#{server}"

              Run `bin/rails server --help` for more options.
            MSG
          else
            error = CorrectableError.new("Could not find server '#{server}'.", server, RACK_SERVERS)
            <<~MSG
              #{error.message}
              Run `bin/rails server --help` for more options.
            MSG
          end
        end

        def print_boot_information(server, url)
          say <<~MSG
            => Booting #{ActiveSupport::Inflector.demodulize(server)}
            => Rails #{Rails.version} application starting in #{Rails.env} #{url}
            => Run `bin/rails server --help` for more startup options
          MSG
        end
    end
  end
end