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。
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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