4.4. 每个部分的 Content-Type 头字段

4.4. Content-Type Header Field for Each Part

🇬🇧 英文原文

Each part MAY have an (optional) Content-Type header field, which defaults to "text/plain". If the contents of a file are to be sent, the file data SHOULD be labeled with an appropriate media type, if known, or "application/octet-stream".

🇨🇳 中文翻译

每个部分可以 (MAY) 有一个(可选的) Content-Type 头字段,默认为 "text/plain"。如果要发送文件的内容,文件数据应该 (SHOULD) 标记为适当的媒体类型(如果已知),或者标记为 "application/octet-stream"。