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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.This article is reproduced from: http://blog.csdn.net/eric_sunah/article/details/72782302? Utm_source=tuicool&Utm_medium=referral, for the purpose of transmitting more information, the copyright belongs to the original author or the source organization.　　Prinoot和Pramida又见面了，但却站在对岸，成了死敌。虽然他们有双胞胎，不是爱的锁链，而是不情愿地把他们绑在一起的敌人的锁链。Article 7 [Supervision and Law Enforcement Agencies] Medical security supervision and law enforcement agencies are entrusted by the medical security administrative department to carry out medical security supervision and inspection and other administrative law enforcement work.愤青见状大喜，哎呀妈呀，找到更大的马蜂窝可以捅了。