Are HTTP Request Workflows made from the Finesse server or the browser?
If you create a workflow of type HTTP Request, these requests are made via the Finesse server. Make sure that the Finesse server can ping the hostname/IP Address of the HTTP request URL.
Here is some sample code:
var http = new XMLHttpRequest();
var url = "https://localhost:8082/api";
http.open("GET", url, true);
http.timeout = 2000;