Curl error thrown f or http POST #520

How could the issue be reproduced? (Steps to reproduce)

PHP Fatal error: Uncaught Facebook\WebDriver\Exception\WebDriverCurlException: Curl error thrown f
or http POST to /session/9756a112-36bf-4999-bae7-59d8f506c253/url with params: {"url":"http://gam
e.hao123.com"}
Operation timed out after 30000 milliseconds with 0 bytes received in ...

$host = 'http://localhost:4444/wd/hub'; // this is the default
$capabilities = DesiredCapabilities::htmlUnit();
$capabilities->setJavascriptEnabled(false);
$driver = RemoteWebDriver::create($host, $capabilities, 5000);
//or
//$driver = RemoteWebDriver::create($host, $capabilities, 5000,5000);
$driver->get('http://game.hao123.com');
$html =$driver->getPageSource();

Details

• Php-webdriver version: 1.5
• PHP version: 7.1.7(cli)
• Selenium server version: 3.8.1
• Operating system: win 10
• Browser used + version: htmlUnit ?