Problem with Laravel, GuzzleHttp Request and Cloud9 - php

Question

I am trying to implement GuzzleHttp Application in my React/Laravel App.
This is my Routes:
This is my Controller Code:
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
class AuthController extends Controller
{
public function login(Request $request){
$http = new \GuzzleHttp\Client;
try {
$response = $http->post(route('passport.token'), [
'form_params' => [
'grant_type' => 'password',
'client_id' => config('gocv.passport.client_id'),
'client_secret' => config('gocv.passport.client_secret'),
'username' => $request->username,
'password' => $request->password,
],
'headers' => [
// 'User-Agent' => 'testing/1.0',
'Accept' => 'application/json'
]
]);
return $response->getBody();
} catch (\GuzzleHttp\Exception\BadResponseException $e) {
if($e->getCode() == 400)
{
return response()->json('Invalid Request. Please Eneter username and password', $e->getCode());
}
else if($e->getCode() == 401)
{
return response()->json('Invalid Credentials', $e->getCode());
}
return response()->json('Something Went Wrong', $e->getCode());
}
}
}
This is my Postman Request:
When I am trying to do Post Request on this route: (api/login) it does not return any response. server just stops working and I need to restart it.
Enviroment is AWS Cloud9, php version 7.2 and laravel version 5.7 running with only php artisan serve --port=8082 --host=0.0.0.0
Note: when I send get request on other site ex: github.com it returns response. the problem is when I am trying to do request on same IP.
PS. when I try to login on route /oauth/token it works and returns token
Any answer will be apreciated . Thanks.