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MIME is an Internet Standard for Multipurpose Internet Mail Extensions,

MIME was developed to provide a way of embedding binary content in E-mail. Traditional E-mail is only guaranteed to support the 7-bit ASCII character set, so a way was needed to encode 8-bit binary content such as programs, images, sounds, and movies in a form that could be carried in a 7-bit E-mail message.

MIME was designed so that different character encoding schemes could be developed, and also provided a simple sort of metadata in the form of MIME types[?], so that applications could work out what kind of content was contained in the E-mail message, and therefore know what kind of processing was needed to use the content.

A MIME multipart message contains a boundary in the Content-type: header; this boundary, which must not occur in any of the parts, is placed between the parts, and at the beginning and end of the body of the message, as follows:

Content-type: multipart/mixed; boundary="frontier"
MIME-version: 1.0

Content-type: text/plain

This is the body of the message.
Content-type: application/octet-stream
Content-transfer-encoding: base64


Although HTTP does not use MIME encoding, it re-used the concept of MIME types to encode the types of binary content.


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