Trying to control a Sonoff DIY switch direct from Loxone miniserver, how to debug?

[Gast]

I'm trying to control a Sonoff DIY switch direct with the loxone miniserver over a virtual output. (no loxberry, no tasmota)
I can control the switch using my Chrome browser with the RESTer extension. Black screenshot below.
Within Loxone I try to do the same but this is not working. Screenshots below.
How can I debug this? Right now I'm updating every change to the server to test. But that takes time and annoys my family members...

[Christian Fenzl]

Simply do it as the help says 😉

Address is http://server:andport

Command for ON is /put/in/your/url/without/hostport

[Gast]

Thank you for your help, I got it working now!

Can I ask you where you find this help?
I do see some tekst on the left bottom of my screen (Help in Dutch). That does not explain what you write at all.
Also online using this link https://www.loxone.com/enen/kb/virtual-inputs-outputs/ I don't see that explanation for the Command ON text.

[Gast]

Here how I got it working with your help.
See also Dutch help text on the left bottom.