Add error in callback

[TakeshiDaveau]

Hi,

I was watching in your code to check if it was possible to be informed when the slack api answer with an error, but it's not possible

function executeGetRequest(url, callback) {
            $http.get(url).
              success(function (result) {
                  if (callback)
                      callback(result);
              }).
              error(function (data, status) {
                  $log.log(status);
                  $log.log(data);
              });
        } 

Is it possible to get an error in the callback ?
Exemple :

function executeGetRequest(url, callback) {
            $http.get(url).
              success(function (result) {
                  if (callback)
                      callback(result);
              }).
              error(function (data, status) {
                  if (callback)
                      callback(null, status);
                  $log.log(status);
                  $log.log(data);
              });
        } 

Or something like that ?

Thanks in advance