php curl post json Could not resolve host

Question

1.在linux下通过curl直接请求ok2.把代码里面的地址换成ip，请求正常3.代码如下：private function post($url, $data, $timeout = 3)     {         $jsonData = json_encode($data);         $ch = curl_init();         curl_setopt($ch, CURLOPT_URL, $url);         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);         curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json;Charset=utf-8','Content-Length :'.strlen($jsonData)]);         curl_setopt($ch, CURLOPT_POST, 1);         curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);         $resp = curl_exec($ch);        if ($resp === false) {             Yii::info('resp err:'.curl_error($ch));             curl_close($ch);            return [];         }         curl_close($ch);        return json_decode($resp, true);     }研究了半天，不知道哪有问题，一直无法解析域名。服务器是阿里云的，对方服务器是腾讯云.哪位大神指导一下。