当到远程主机的所有连接都被切断时，每个控制套接字都就会被移除。
Each control socket is removed when all connections to the remote host are severed.
响应缓存的问题不复存在，因为这个套接字直接受应用程序的控制。
There are no issues of response buffering because this socket is under direct control of application.
还有用于套接字、网络接口、主机和端口的网络访问控制。
There are also network access controls for sockets, network interfaces, hosts, and ports.
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