Sending HTTP commands with cookies

I’ve been playing with Razberry Zway and linux. I would like to send HTTP commands from Smartthings to the server on the same lan. The HTTP SmartApp works great with my Tasmota devices, but does not when using the Z-way API.

The command even works when sent through a web browser, http://192.168.1.210:8083/ZAutomation/api/v1/devices/DummyDevice_20/command/on , but not from the hub. I believe the issue has somethingwith cookies, but can’t figure out what to do. Has anyone figured this out? Thanks in advance.