Retrieve the content for this Document from the server

        :type force_download: Boolean
        :param force_download: True to download from the server
            regardless of the cache's contents

        :rtype: String
        :returns: the content data

        :raises: APIError if the API request is not successful

def get_content(self, force_download=False):
        """ Retrieve the content for this Document from the server

        :type force_download: Boolean
        :param force_download: True to download from the server
            regardless of the cache's contents

        :rtype: String
        :returns: the content data

        :raises: APIError if the API request is not successful


        """
        return self.client.get_document(self.url(), force_download)