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However, this method has great limitations. XMLHttpRequest requests are usually used for asynchronous refresh of local pages in Ajax methods. Not all requests are suitable to be initiated by this class, and the pages obtained through this class of requests cannot be recorded by browsers, thus carrying out operations such as forward, backward, refresh and collection, which brings inconvenience to users. In addition, for legacy systems that do not have CSRF protection, to use this method to protect, to change all requests to XMLHttpRequest requests, this is almost to rewrite the entire website, which is undoubtedly unacceptable.围观的人见黄豆轻描淡写地把卫讼师气得直喘气，都忍不住开心笑。他不是一个好哥哥。In the system, how do we need to reuse an object, if we repeatedly use the new operator to create the object at this time, it is a great waste of system resources. Since we use the same object every time, why can't we share it? This is also the reason why the model of enjoying yuan appears.Slow POST attack uses POST request method. The attacker sends POST request message to the target server to submit data. The length of the data is set to a large value. However, in the subsequent data transmission, only a small message is sent each time, which causes the target server to wait for the attacker to send data. If an attacker controls a large number of zombie hosts to launch such attacks on the target server, the server will run out of resources and cannot provide services normally.这是好事啊。Children. Remove (node);