'Makes this request field into a multipart request field.
This method overrides "Content-Disposition", "Content-Type" and
"Content-Location" headers to the request parameter.
:param content_type:
The \'Content-Type\' of the request body.
:param content_location:
The \'Content-Location\' of the request body.'

def make_multipart(self, content_disposition=None, content_type=None, content_location=None):

    self.headers['Content-Disposition'] = (content_disposition or 'form-data')
    self.headers['Content-Disposition'] += ';    '.join(['', self._render_parts((('name', self._name), ('filename', self._filename)))])
    self.headers['Content-Type'] = content_type
    self.headers['Content-Location'] = content_location
