Apex Callout from one Org to another with method GET

Question

Org 2 has GET Method:

@RestResource(urlMapping='/jobShow/*')
global with sharing class RestJob {

    @HttpGet
    global static List<Job__c> getJob(){
        List<Job__c> jobList;

        try{
            jobList = [SELECT Description__c 
                          FROM Job__c];  
        } catch(Exception e){
            System.debug('Error: ' + e.getMessage());
        }
        return jobList;     
    } 
}

Org 1 has Remote Site with link to Org 2: https://***.lightning.force.com

Org 1 also has a Callout Method:

public class HttpCalloutJob {

    public String getCalloutResponseContents(String url) {
    Http h = new Http();
    HttpRequest req = new HttpRequest();
    req.setEndpoint('https://***.lightning.force.com/services/apexrest/jobShow');  //I don't know: is it right Link or not?
    req.setMethod('GET');

    HttpResponse res = h.send(req);   
    System.debug('Body: ' + res.getBody());
    return res.getBody();     
  }
}

Then I try to Execute this part

Http h = new Http();
HttpRequest req = new HttpRequest();
req.setEndpoint('https://***.lightning.force.com/services/apexrest/jobShow');
req.setMethod('GET');
HttpResponse res = h.send(req);      
System.debug('Body: ' + res.getBody());

in Execute Anonymous Window, and become empty Body. But from workbench all is ok: it's not empty.

I think my link is wrong or I didn't connect my Orgs. How can I fix it?

Answer 1

Are you passing an access token alongwith with request? You will need a token which will get you access to Org2. When you will make a request to the access token, you will get instance url returned as a part of the response as well.

The instance-url returned is the link/url that you will need to hit.

Answer 2

You need to add the consumer key/ secret key along with endpoint URL