private function setHeaderContentType()
    {
        $fileName = basename( $this->fileName );
        if ( $this->contentDisposition !== null && $this->contentDisposition->fileName !== null )
        {
            $fileName = $this->contentDisposition->fileName;
        }

        $this->setHeader( 'Content-Type',
                          $this->contentType . '/' . $this->mimeType . '; ' . 'name="' . $fileName . '"' );
    }