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Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system!在温馨祥和的闯堂镇上，一场全镇居民期待已久的祈愿大会即将举行。闯堂兔和他的小伙伴们正在忙碌的准备着。就在此时，一个意外的发现让闯堂兔发现，似乎有一股黑暗的势力要破坏这场盛大的祈愿大会，更让人惊讶的是：这突如其来的危机，又与闯堂兔神秘失踪多年的父亲兔博士有着千丝万缕的联系。一段童趣荡漾而又精彩纷呈的快乐冒险就这样开始了……In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, What makes these packets special is that, The destination IP address points to the server, router, and other facilities that act as reflectors, while the source IP address is forged as the target IP address, When the reflector receives the data packet, it will think whether the data packet is requested by the attack target, so it will send the corresponding data to the attack target. When a large number of response data packets flock to the attack target, it will deplete the network broadband resources of the target, resulting in denial of service attacks.Generally speaking, classifiers will face two kinds of antagonistic inputs sooner or later: mutation input, which is a variant of known attacks specially designed to avoid classifiers; Zero-day input, which has never been seen before the payload. Let's explore each antagonistic input in turn.Another way to save iptables rules is to use the iptables-save command5. Global--Publish Subscription Object Code Encapsulation