def url(self):
        """
        Returns the URL for the current transformation, which can be used
        to retrieve the file. If security is enabled, signature and policy parameters will
        be included

        *returns* [String]

        ```python
        transform = client.upload(filepath='/path/to/file')
        transform.url()
        # https://cdn.filestackcontent.com/TRANSFORMS/FILE_HANDLE
        ```
        """
        return utils.get_transform_url(
            self._transformation_tasks, external_url=self.external_url,
            handle=self.handle, security=self.security, apikey=self.apikey
        )
Returns the URL for the current transformation, which can be used
        to retrieve the file. If security is enabled, signature and policy parameters will
        be included

        *returns* [String]

        ```python
        transform = client.upload(filepath='/path/to/file')
        transform.url()
        # https://cdn.filestackcontent.com/TRANSFORMS/FILE_HANDLE
        ```