Read multiple parameters from HTTP In node

General
3

Try using
curl -X GET 'http://localhost:1880/zone?x=3&y=4&radius=5'

p.s.
A http in node must be paired with a http response node, your flow seems to be missing a http response node.
From the http in node help text

Note: this node does not send any response to the request. The flow must include an HTTP Response node to complete the request.

Also your flow json is corrupt as you have not followed forum guide lines when posting code.

In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)

``` 
   code goes here 
```

You can edit and correct your post by clicking the pencil :pencil2: icon.

See this post for more details - How to share code or flow json