composer require symfony/browser-kit

use Symfony\Component\BrowserKit\HttpBrowser;
use Symfony\Component\HttpClient\HttpClient;

$browser = new HttpBrowser(HttpClient::create());
$crawler = $browser->request('GET', 'https://example.com');

// JSON request
$crawler = $browser->jsonRequest('GET', '/api/endpoint', ['key' => 'value']);

// AJAX request
$crawler = $browser->xmlHttpRequest('GET', '/api/endpoint');

$crawler = $browser->clickLink('Go elsewhere...');

// With custom headers
$crawler = $browser->clickLink('Go elsewhere...', ['X-Custom-Header' => 'value']);

$browser->submitForm('Log in', [
    'login' => 'my_user',
    'password' => 'my_pass',
]);

// With HTTP method and server params override
$browser->submitForm('Log in', ['login' => 'user'], 'PUT', ['HTTP_ACCEPT_LANGUAGE' => 'es']);

use Symfony\Component\BrowserKit\Cookie;
use Symfony\Component\BrowserKit\CookieJar;

$cookieJar = $browser->getCookieJar();
$cookie = $cookieJar->get('name_of_the_cookie');

// Set cookies before request
$cookie = new Cookie('flavor', 'chocolate', strtotime('+1 day'));
$cookieJar = new CookieJar();
$cookieJar->set($cookie);

$crawler = $browser->back();
$crawler = $browser->forward();
$browser->restart(); // clears history and cookies

use Symfony\Component\BrowserKit\AbstractBrowser;
use Symfony\Component\BrowserKit\Response;

class TestClient extends AbstractBrowser
{
    protected function doRequest($request): Response
    {
        return new Response($content, $status, $headers);
    }
}