`MEMCACHED_BEHAVIOR_USE_UDP` has been set. Executing any of these
functions with this behavior on will result in `MEMCACHED_NOT_SUPPORTED` being returned, or for those functions which do not return a :type:`memcached_return_t`, the error function parameter will be set to `MEMCACHED_NOT_SUPPORTED`.
-RETURN
-------
+RETURN VALUE
+------------
All objects retrieved via :func:`memcached_get` or :func:`memcached_get_by_key` must be freed with :manpage:`free(3)`.