Identification issue while using Custom Macro in order to send GET request to JIRA from Confluence

[Karim]

import groovyx.net.http.ContentType
import groovyx.net.http.RESTClient
import groovyx.net.http.Method

def jira = new RESTClient("http://localhost:8080");
jira.contentType = ContentType.JSON;
def resp = "null";
try
{
 /* Return me all the fields == OK*/
 resp = jira.get(path: "/rest/api/2/field");
 "<div>"+resp.getData()+"</div>"
 
/* I'm not allowed to access any of the given jiraID == KO*/
 resp = jira.get(path: "/rest/api/2/issue/${parameters.jiraId}");
 "<div>"+resp.getData()+"</div>"
 
}
catch( ex ) { 
 "<div>Message : "+ex.response.getData()+"</div>\n"+
 "<div>URL : "+jira.contentType+"</div>\n"+
 "<div>Id : ${parameters.jiraId}</div>\n"+
 "<div>"+resp.toString()+"</div>"
}

My JIRA instance is currently running on localhost machine (as the Confluence instance).

It works for both requests when I simply send them using the browser.

Any Clue ?

Thanks in advance