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subtype will be automatically included in the Content-Type header.
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parameter.
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transport of the image data. It takes one argument, which is this
Image instance. It should use get_payload() and set_payload() to
change the payload to the encoded form. It should also add any
Content-Transfer-Encoding or other headers to the message as
necessary. The default encoding is Base64.
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constructor, which turns them into parameters on the Content-Type
header.
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