Laravel Socialite: Missing required parameter: redirect_uri

I am using Laravel 5.3 with Socialite.

I am getting 400 Bad Request error with message:

Missing required parameter: redirect_uri

The URL it generates is:

http://ift.tt/2hoZGrC

Details below:

service.php

'google' => [
        'client_id' => '1234455-u3ifk8tr1qs41487fmevg2h2s1v6ubue.apps.googleusercontent.com',
        'client_secret' => 'DxSOS0p1xKNuPger3IS_E4-i',
        'redirect' => 'http://localhost:8000/google/callback',
    ],

Routes

Route::get('/{provider}/redirect', 'Auth\RegisterController@redirectToProvider');
Route::get('/{provider}/callback', 'Auth\RegisterController@handleProviderCallback');

Authorized URI settings in Google Console

http://localhost:8000/google/callback

Controller

public function handleProviderCallback($provider)
    {
        try {
            $social_user = Socialite::driver($provider)->user();

        } catch (Exception $e) {
            return redirect('/');
        }
}

via Chebli Mohamed