Thanks for your reply and sorry that it took me so long to answer.
I had the http in node already configured as a POST one. And I've got a http response node connected as well.
As url endpoint I've set "/test" as in the http request.
I've tried another way to send http messages, to see if my tasker settings were the cause.
It's a website where you can change your settings pretty easily.
Unfortunately I still can't send messages.
I tried the POST method as well as the GET method. Both will give me errors, as you can see in the screenshot.
It's only the GET method without the "/test" that's coming through. But then I don't get anything to see inside node red.
Is there anything like a firewall that's preventing the message from being delivered?