In a default configuration, in some Web servers, this content header will reference an IP address and may or may not provide the fully qualified domain name (FQDN).
在一些服务器的默认配置中,这个内容头部将引用一个IP地址,或者可能提供也可能不提供完全限定域名(FQDN)。
However, the IP address as well as FQDN can be used in both the cases.
但是,在这两种情况下都可以使用IP地址和FQDN。
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