Server side API Action questions

Hi,
I am trying to get a server side action to send an API request to another server and pass the response back to my client side. I am using the “API action” step and trying to GET a response where I set the URL to "http://localhost:3000/api_name/param1/param2/param3 and return HTML content.

1. Can I set the port etc as in “http://localhost:3000/…” in the URL UI control?
2. Does the schema definition support the method of passing the params as shown above?

How do I use the API action component to accomplish this?
Thank you for the help.