네이버로그인 관련 Couldn't resolve host 'nid.naver.com' 에러출력 관련사항 ㅠㅠㅠㅠ 채택완료

function get_access_token($code)
    {
        $url = $this->token_url.'?client_id='.$this->client_id.'&client_secret='.$this->secret_key.'&grant_type=authorization_code&state='.$this->token.'&code='.$code;

        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);

    

    

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);


        $json = curl_exec($ch);

        $err = curl_error($ch); 
        echo $err; 
        exit;

        curl_close($ch);

        

        if($json) {
            $result = json_decode($json);

            $this->access_token  = $result->access_token;
            $this->refresh_token = $result->refresh_token;

            return true;
        } else {
            return false;
        }
    }

$json = curl_exec($ch);

        $print_r($json);

        curl_close($ch);