Packing components into a multipart document is like an email with attachments, it helps you fetch several components with one HTTP request (remember: HTTP requests are expensive).
把页面内容打包成复合文本就如同带有多附件的Email，它能够使你在一个HTTP请求中取得多个组件(切记：HTTP请求是很奢侈的)。
The actual stream is written out as a multipart mime document with the mime type set to text and the encoding set to none.
实际的流是以一种multipartmime文档形式写出，mime类型设为text，编码设为none。
The actual stream is written out as a multipart mime document with the mime type set to text and the encoding set to none.
实际的流是以一种multipartmime文档形式写出，mime类型设为text，编码设为none。
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