定义主机端口。
转发主机端口不一定要与Balance所控制的端口相同。
The forwarding host post is not required to be the same port being controlled by Balance.
缺省情况下,客户机将尝试连接到运行在本地主机端口49152上的服务器。
The client will by default attempt to connect to a server running on port 49152 on localhost.
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