Mime Content Type 预设副档名
Each MIME part with attachment can specify its content type too.
每个带附件的MIME部件也都可以指定其内容类型。
You can extract a number of information from the MIME body part including the content id, content type, and location.
您可以从MIME主体部件抽取许多信息，包括内容标识、内容类型和位置。
If for whatever reason you're unable to configure the server for content negotiation, you will have to resort to scripting to determine the MIME type to serve the document.
如果不管什么原因。你不能配置服务器的内容转换机制，那么你只能通过脚本来决定文档的MIME类型。
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