How to use a Transient RESTHost in Orchestrator

private RESTRequestExecute(strMethod:string, strFQDN:string, strUri:string, strUserName:string, strPassword:string, objContentJson:any)
let arrRESTAuthenticationParams: string[] = ['Shared Session', strUsername, strPassword];
let objRESTAuthentication: RESTAuthentication = RESTAuthenticationManager.createAuthentication('Basic', arrRESTAuthenticationParams);
let objRESTHost: RESTHost= RESTHostManager.createHost("TransientHost");
objRESTHost = RESTHostManager.createTransientHostFrom(objRESTHost);
objRESTHost.url = "https://" + strFQDN;
let objRESTRequest: RESTRequest= objRESTHost.createRequest(strMethod, strUri, objContentJson);
objRESTRequest.contentType = "application/json";
let objRESTResponse: RESTResponse= objRESTRequest.execute();
if (objRESTResponse.statusCode === 200)
{
let objProperties: Properties = objRESTResponse.getAllHeaders();
let arrKey: string[] = objProperties.keys;
arrKey.forEach((strKey: string): void => {
System.log(`REST Response Header ${strKey}: ${objProperties.get(strKey)}`);
let arrHeaderValues: string[] = objRESTResponse.getHeaderValues(strKey);
System.log(`REST Response Header ${strKey}: ${JSON.stringify(arrHeaderValues, null, 4)}`);
});
// If you know the schema of the return then define a type or interface and replace "any".
System.log("REST Response Content Length: " + objRESTResponse.contentLength);
if (objRESTResponse.contentLength > 0)
{
let objRESTResponseBody: any = JSON.parse(objRESTResponse.contentAsString);
// Process the Json
}
}
else
{
System.log("Something went wrong...");
}