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When the component is rendered and updated, the method will be called to check the attribute change. Here, the method under the module will be finally called after compatible processing of different events under the execution module, and the event handling function will be put on the object for the key value.When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.又对胡镇骂道：猪，你这头猪。“警察什么的，我要辞职了！”Resolution: Sparse arrays will skip these "pits" that have not been assigned values. So only ary [0] can be traversed to史蒂文·奈特（Taboo，Peaky Blinders）对狄更斯的标志性幽灵故事进行了独创的解读。 圣诞颂歌是对Scrooge灵魂黑暗之夜的一种刺痛感。【感情线索】