Share your flow and I'll take a look.
Also, if you can, share a curl or build a http request in the demo flow to call the http node.
When posting a flow, 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
```
See this post for more details - How to share code or flow json