@gen.coroutine
    def info_db(self, db_name=None):
        r = yield self._http_get(db_name or self.db_name)
        raise gen.Return(r)
Checks S3 key format: 20 alphanumeric chars starting with GOOG.
dataset/ETHPy150Open nephics/tornado-couchdb/couch/couch.py/AsyncCouch.info_db--crossover with--dataset/ETHPy150Open apache/libcloud/libcloud/common/google.py/GoogleAuthType._is_gcs_s3