src/ServiceProviders/Security/NullEntryPoint.php
public function start(Request $request, AuthenticationException $authException = null)
    {
        $msg = $authException ? $authException->getMessage() : 'Access Denied';
        throw new AccessDeniedHttpException($msg);
    }
public function start(Request $request, AuthenticationException $authException = null)
    {
        $msg = $authException ? $authException->getMessage() : 'Access Denied';
        throw new AccessDeniedHttpException($msg);
    }
public function start ( Request $ request , AuthenticationException $ authException = null ) { $ msg = $ authException ? $ authException -> getMessage ( ) : 'Access Denied' ; throw new AccessDeniedHttpException ( $ msg ) ; }
Returns a response that directs the user to authenticate.

This is called when an anonymous request accesses a resource that
requires authentication. The job of this method is to return some
response that "helps" the user start into the authentication process.

Examples:
A) For a form login, you might redirect to the login page
return new RedirectResponse('/login');
B) For an API token authentication system, you return a 401 response
return new Response('Auth header required', 401);

@param Request                 $request       The request that resulted in an AuthenticationException
@param AuthenticationException $authException The exception that started the authentication process

@return Response
Returns a response that directs the user to authenticate .