Hi All,

I am doing Apex Rest Callouts in Trailhead Apex Integration Service Module.
https://developer.salesforce.com/trailhead/force_com_dev_intermediate/apex_integration_services/apex_integration_rest_callouts

This is AnimalLocator class.

public class AnimalLocator{
    public static String getAnimalNameById(Integer x){
        Http h = new Http();
        HttpRequest req = new HttpRequest();
        
        req.setEndpoint('https://th-apex-http-callout.herokuapp.com/animals/' + x);
        
        req.setMethod('GET');
        
        HttpResponse res = h.send(req);
        Map<String, Object> results = (Map<String, Object>)JSON.deserializeUntyped(res.getBody());
        Map<String, Object> animal = (Map<String, Object>) results.get('animal');
        return (String)animal.get('name');
    }
}

However, I was encountered this error when checking challenge.

Challenge Not yet complete... here's what's wrong: 
The Apex class does not appear to be calling the REST endpoint using HttpRequest.

I have no idea what it means, but I have call the REST endpoint.