域名别名
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域名别名是指向与主域名相同网站或电子邮件服务的附加域名。与 [[domain-forwarding|域名转发]] 不同，别名直接提供相同内容而无需重定向，地址栏中保持别名 URL 不变。
示例
A company might use your-brand.com as primary with your-brand.io and your-brand.co as aliases, all serving the same website.