This method accepts an array of the
Request objects and returns an array of the
Response objects.
Keys of the response array correspond the ones from request array.
php
$client = new Client();
$requests = [
'news' => $client->get('http://domain.com/news'),
'friends' => $client->get('http://domain.com/user/friends', ['userId' => 12]),
];
$responses = $client->batchSend($requests);
var_dump($responses['news']->isOk);
var_dump($responses['friends']->isOk);
