Fluentd Endpoint can not start with 'http' or 'https', please use host name

Hallo,
the example in the dokumation
https://rancher.com/docs/rancher/v2.x/en/cluster-admin/tools/logging/fluentd/
says
In the Endpoint field, enter the address and port of your Fluentd instance, e.g. http://Fluentd-server:24224 .
but it end with the message Endpoint can not start with ‘http’ or ‘https’, please use host name.
Thanks for a hint
Ralf