How to use the parfive.utils.default_name function in parfive

`HTTPS_PROXY`, depending on the protocol of the `url` passed. Proxy
        Authentication `proxy_auth` should be passed as a `aiohttp.BasicAuth`
        object. Proxy Headers `proxy_headers` should be passed as `dict`
        object.

        """
        overwrite = overwrite or self.overwrite

        if path is None and filename is None:
            raise ValueError("Either path or filename must be specified.")
        elif path is None:
            path = './'

        path = pathlib.Path(path)
        if not filename:
            filepath = partial(default_name, path)
        elif callable(filename):
            filepath = filename
        else:
            # Define a function because get_file expects a callback
            def filepath(*args):
                return path / filename

        scheme = urllib.parse.urlparse(url).scheme

        if scheme in ('http', 'https'):
            get_file = partial(self._get_http, url=url, filepath_partial=filepath,
                               overwrite=overwrite, **kwargs)
            self.http_queue.put_nowait(get_file)
        elif scheme == 'ftp':
            if aioftp is None:
                raise ValueError("The aioftp package must be installed to download over FTP.")