curl 请求阻塞

<?php
require __DIR__ . '/vendor/autoload.php';
use Workerman\Worker;
$worker = new Worker('websocket://0.0.0.0:6666');

$worker->onMessage = function ($con, $data) {
   $http = new Workerman\Http\Client();
   $http->get('http://example.com/', function($response) use ($con) {
            $con->send($response->getBody());
        }, function($exception){
            echo $exception;
        });
};
Worker::runAll();