public function setProxy($proxy)
 {
     if (!empty($proxy['proxy_user_host'])) {
         $this->config->setProxyHost($proxy['proxy_user_host']);
     }
     if (!empty($proxy['proxy_user_port'])) {
         $this->config->setProxyPort($proxy['proxy_user_port']);
     }
     if (!empty($proxy['proxy_user_name'])) {
         $this->config->setProxyUsername($proxy['proxy_user_name']);
     }
     if (!empty($proxy['proxy_user_password'])) {
         $this->config->setProxyPassword($proxy['proxy_user_password']);
     }
 }