Why can't I get response from my Docker/ReactPHP app outside the container?

I have faced with the problem! Can’t get the response from browser or postman in my Docker/ReactPHP app.

This is my code:

docker-compose.yaml

version: '3.8'

services:
  react_php_service2:
    container_name: react_php_service2
    build:
      context: .
      dockerfile: ./.docker/php/Dockerfile
    ports:
      - "8000:8000"
    extra_hosts:
      - "host.docker.internal:host-gateway"
    volumes:
      - ./reactphp:/app

Dockerfile

FROM php:8.0-alpine

COPY ./reactphp /app
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

COPY ./.docker/php/entrypoint.sh /entrypoint.sh

RUN ["chmod", "+x", "/entrypoint.sh"]

ENTRYPOINT /entrypoint.sh

CMD [ "php", "./app/server.php"]

entrypoint.sh

#!/bin/sh

cd app/
composer install
php server.php

server.php

require 'vendor/autoload.php';

use PsrHttpMessageServerRequestInterface;

$loop = ReactEventLoopLoop::get();

$server = new ReactHttpHttpServer(function (ServerRequestInterface $request) {
    echo date('Y-m-d H:i:s') . ' ' . $request->getMethod() . ' ' . $request->getUri() . PHP_EOL;
    //return ReactHttpMessageResponse::plaintext("Hello World!n");
    return new ReactHttpMessageResponse(200, ['Content-Type' => 'text/plain'], 'Hello, World!');
});

$socket = new ReactSocketSocketServer('127.0.0.1:8000', [], $loop);
$server->listen($socket);

echo 'Listening on ' . str_replace('tcp:', 'http:', $socket->getAddress()) . "n";

$loop->run();

So in docker container it works fine:
Send request
Get response.

But it doesn’t work in the browser or Postman – anywhere outside container:
Browser result.