'Do a GET / to fetch available API version information.'

def list_versions(self):

    version_url = self._get_base_version_url()
    start = time.time()
    self._log_request_start('GET', version_url)
    (response, body) = self.raw_request(version_url, 'GET')
    self._error_checker(response, body)
    end = time.time()
    self._log_request('GET', version_url, response, secs=(end - start), resp_body=body)
    self.response_checker('GET', response, body)
    self.expected_success(200, response.status)
    body = json.loads(body)
    return body
