这个文件告诉服务器如何执行主机名解析，这与Solaris服务器上nsswitch . conf文件的作用很相似。
This file tells the server how to perform host name resolution, much like how the nsswitch.conf file works on Solaris servers.
主机名：是Informix服务器被部署到的机器。
Host Name: The machine on which you have Informix server deployed.
这一行通知代理服务器将代理请求上的主机名设置为代理服务器上的主机名。
This line informs the proxy server to set the host name on the proxy request to that of the proxy server.
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