public function __construct($endPoint, $accessId, $accessKey, Config $config = NULL)
{
if ($config == NULL) {
$config = new Config();
}
$this->accessId = $accessId;
$this->accessKey = $accessKey;
$this->client = new \GuzzleHttp\Client(['base_uri' => $endPoint, 'defaults' => ['headers' => ['Host' => $endPoint], 'proxy' => $config->getProxy(), 'expect' => $config->getExpectContinue(), 'timeout' => $config->getRequestTimeout()]]);
}