在 HTTP 请求的头部中，该应用程序客户端必须提供基本验证头部（其包含已授权用户的用户 ID 和密码）。
The application client must provide a basic authentication header (which contains an authorized user’s user ID and password) in the HTTP header of the HTTP request.
无格式文本头部中给出的几个元数据字段，Creator、Identifier和Description属于DCMI的15种基本元素。
Several of the metadata fields given in the plain text header — Creator, Identifier, and Description — belong to DCMI's set of 15 basic elements.
css—grid css文件被用来组织布局和结构。通过定义基本的头部，底部和列设置为你网站的创建轮廓，线框模型(winframe)。
Grid.css -a grid CSS file can have your layout structure (and act as the wireframe of your site, by defining the basic header, footer, and column set up).
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