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英台恢复女儿装 ，兰麝满身世无双 。方知英台是女郎 ，情定三生拜高堂。多情自古多离伤 ，父母之命打鸳鸯 。楼台相会绝情殇，化为蝴蝶飞成双 。今人尤伤情意长 ，梁祝化蝶千古唱…到了这个时候，死亡已经是注定的事情，一个已经淡然接受了生死事实的人，还有什么可怕的？若是尹旭想要对楚军出手，直接动兵就行了，以眼前这支骑兵的规模，对付自己这点人是足够了。This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:Especially in some forums and other websites that support users to publish their own content, hackers can publish the addresses of their personal websites on them. Since the system will also add a token to this address, hackers can get the token on their own websites and launch CSRF attacks immediately. In order to avoid this, the system can add a judgment when adding token. If the link is linked to its own site, the token will be added later, and if it is connected to the external network, it will not be added. However, even if the csrftoken is not attached to the request in the form of a parameter, the hacker's website can also obtain the token value through the Referer to launch a CSRF attack. This is also why some users like to manually turn off the browser Referer function.