Laravel Socialite Request возвращает NULL

Я использую Laravel Socialite 5.0.

<?php

use Illuminate\Http\Request;

public function login(AuthenticateUser $authenticateUser, Request $request){
return $authenticateUser->execute($request->has('code'));
}

$request->has('code') всегда возвращает ноль. Это почему?
Предоставляя мой класс AuthenticateUser, я вижу это как проблему перенаправления / запроса.

<?php

namespace App;

use Laravel\Socialite\Contracts\Factory as Socialite;
use Illuminate\Contracts\Auth\Guard as Guard;
use App\Repositories\UserRepository as UserRepository;
use Log;

class AuthenticateUser {

private $users;
private $socialite;
private $auth;

public function __construct (UserRepository $users, Socialite $socialite, Guard $auth) {
$this->users = $users;
$this->socialite = $socialite;
$this->auth = $auth;
}

public function execute ($hasCode) {
if( ! $hasCode){
Log::info('1');
return $this->getAuthorizationFirst();
}
Log::info('2');
$user = $this->socialite->driver('github')->user();
}

public function getAuthorizationFirst(){
return $this->socialite->driver('github')->redirect();
}

}

Добавление класса AuthController для справки:

class AuthController extends Controller {

/*
|--------------------------------------------------------------------------
| Registration & Login Controller
|--------------------------------------------------------------------------
|
| This controller handles the registration of new users, as well as the
| authentication of existing users. By default, this controller uses
| a simple trait to add these behaviors. Why don't you explore it?
|
*/

use AuthenticatesAndRegistersUsers;

/**
* Create a new authentication controller instance.
*
* @param  \Illuminate\Contracts\Auth\Guard  $auth
* @param  \Illuminate\Contracts\Auth\Registrar  $registrar
* @return void
*/
public function __construct(Guard $auth, Registrar $registrar)
{
$this->auth = $auth;
$this->registrar = $registrar;

$this->middleware('guest', ['except' => 'getLogout']);
}

public function login(AuthenticateUser $authenticateUser, Request $request){
Log::info('_'.$request->has('code').'_');
return $authenticateUser->execute($request->has('code'));
}

}