Particle webhook reponse: ENOTFOUND

Good day

I am new to webhooks but think I understand it.

So I am making a webhook to targetprocess but the responce I get is the following:

The webhook I create looks like this:
“eventName”: “process_target”,
“url”: “http://host/api/v1/UserStories/?token=place_holder”,
“requestType”: “GET”,
“mydevices”: true

where host is the host of my targetprocess and place_holder the token for authentication.

When I past the URL in a new tab then I get the xml file I want but when my particle tries to connect to it, I get the error above.

Can anyone please help me out?

Thank you