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filenameis present if Value is of the form
file(File). Value may be any of remaining value specifications.
Content-Disposition: form-data; name="Name"[; filename="<File>"
Content-typeis derived from the File using file_mime_type/2. If the content-type is
text/_, the file data is copied in text mode, which implies that it is read in the default encoding of the system and written using the encoding of the Out stream. Otherwise the file data is copied binary.
character_set(CharSet). This can be used to give a content-type to values that otherwise do not have a content-type. For example:
mime([type(text/html)], '<b>Hello World</b>', )
|Out||is a stream opened for writing. Typically, it should be opened in text mode using UTF-8 encoding.|