Absolutely, Chris. And if you spend a little time mastering the Debugger, you can interactively make calls and examine the response - i.e. playing around with it until you get it right.
https://www.youtube.com/watch?v=6h9Fg-SsToM
So if you HTTP Client Connector is called MyClient, then you could do something like this in the javascript commandline (one line at a time, followed by Enter):
requestEntry = system.newEntry() // create the Request Entry
requestEntry["http.url"] = "
https://reqres.in/api/products/3" // set the url
requestEntry.body = "..." // set up a body if you are using PUT instead of GET
responseEntry = MyClient.connector.queryReply(requestEntry) // call the REST API
task.logmsg(responseEntry.getString("http.bodyAsString")) // print out the response body
task.dumpEntry(responseEntry) // or just dump everything you get back
/Eddie