$client1->enqueue(new http\Client\Request("GET", "http://localhost:$port/"));
$client2->enqueue(new http\Client\Request("GET", "http://localhost:$port/"));
$client1->enqueue(new http\Client\Request("GET", "http://localhost:$port/"));
$client2->enqueue(new http\Client\Request("GET", "http://localhost:$port/"));