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Mathematics:The real threat lies in amplification attacks using reflection principles, In the network service protocol provided by the reflector, There needs to be an asymmetric amount of request and response data, The amount of response data needs to be greater than the amount of request data, The larger the ratio of the response data to the request data, the larger the amplification factor of the amplifier, and the more obvious the effect of consuming bandwidth resources caused by amplification attacks. However, the number deployed on the Internet is very small, so amplification using the network service cannot achieve a large flow and can only be used as an auxiliary means.Note:? Node.js is cached according to the actual file name, not the parameters provided by request (), which means that even if you load it twice through requirement ('express') and requirement ('https://blog.csdn.net/arsaycode/article/details/node_modules/express'), it will not be loaded again, because although the two parameters are different, the file parsed to is the same.8-5 Cities: Write a function called describe_city () that accepts the name of a city and the country to which the city belongs. This function should print a simple sentence, such as Reykjavik is in Iceland. Specifies a default value for the formal parameter used to store the country. This function is called for three different cities, and at least one of them does not belong to the default country.