The name of the part.
The file.
The optional name of the file, if no name is given the name in 'file' is used.
The optional content type.
The optional character encoding (defaults to UTF-8).
The optional content id.
The optional transfer encoding.
The optional character encoding (defaults to UTF-8).
The optional content id.
The optional content type.
The file.
The optional name of the file, if no name is given the name in 'file' is used.
The name of the part.
The optional transfer encoding.
The name of the part.
The file.
The optional name of the file, if no name is given the name in 'file' is used.
The optional content type.
The optional character encoding (defaults to UTF-8).
The optional content id.
The optional transfer encoding.