POST to multiple endpoints using comma separated list

I am setting up an HTTP integration using the Application Server web interface and I notice when defining endpoints “Multiple URLs can be defined as a comma separated list”. I am not able to get that to work. Using a single endpoint works but when I use two only the first one is active. I have tried both URLs as single endpoints and they both work as expected. Is there a special format for the comma separated list? I simply put a comma between the two endpoints.

Hello, did you know how to have two endpoints simultanious?