I tried to make a server file for my ReactPHP app following [this video](https://www.youtube.com/watch?v=7HJFZ25XiQs) but when I started up the server, it ran successfully, but when I made a simple http GET the response was "Error code
500: Internal server error", when in theory it should've returned a JSON {"message": "Hello"}.

Here is the code for the server.php file:

```php
use React\Http\Server;
use React\Http\Response;
use Psr\Http\Message\ServerRequestInterface;
use \React\EventLoop\Factory;

require 'vendor/autoload.php';

$loop = Factory::create();
$server = new Server(function (ServerRequestInterface $request) {
  return new Response(
    200, ['Content-Type' => 'application/json'], json_encode(['message' => 'Hello'])
  );

});
$socket = new \React\Socket\Server('127.0.0.1:8000', $loop);
$server->listen($socket);

echo "Listening on ".str_replace('tcp', 'http', $socket->getAddress()). PHP_EOL;
$loop->run();

```

request.http file:

```
GET 127.0.0.1:8000

```

What the request has returned:

```
HTTP/1.1 500 Internal Server Error
Content-Type: text/plain
Server: ReactPHP/1
Date: Fri, 20 Aug 2021 09:03:19 GMT
Content-Length: 32
Connection: close

Error 500: Internal Server Error

```

Can someone say to me what the problem is? I think I miswrote something in the server.php file but I am not the one to tell