$useragent = 'Mozilla/5.0';
$adapter = new \Zend\Http\Client\Adapter\Curl();
$client = new \Zend\Http\Client($url);
$client->setAdapter($adapter);
$client->setMethod('GET');
$adapter->setOptions(array(
'curloptions' => array(
CURLOPT_USERAGENT => $useragent,
)
));
$respond = $client->send();