The switch case for PRU_DETACH calls tcp_disconnect to check if a connection state is ESTABLISHED.
PRU_DETACH的切换实例调用tcp _ disconnect，以检查连接状态是否为ESTABLISHED。
Ideally, the browser will simply switch over to the IPv4 protocol and make a connection.
理想情况下，浏览器将仅会切换回IPv 4协议并建立连接。
Network connection system, network connection method, and switch used therefor.
网络连接系统，网络连接方法，及所使用的交换机。
Network connection system, network connection method, and switch used therefor.
网络连接系统，网络连接方法，及所使用的交换机。
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