A convenient way to find a free port is to pass in a null address, which automatically binds the socket to the local host address and USES a free ephemeral port.
找到空闲端口的便利方法是传递一个null地址，它会自动将套接字绑定到本地主机地址，并使用空闲的临时端口。
A convenient way to find a free port is to pass in a null address, which automatically binds the socket to the local host address and USES a free ephemeral port.
找到空闲端口的便利方法是传递一个null地址，它会自动将套接字绑定到本地主机地址，并使用空闲的临时端口。
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