卷曲功能不会返回响应

Question

我想打电话给Api。我已经使用了Curl并创建了一个库。当我从控制器调用Curl库函数时，它返回NULL但是如果我打印响应它会显示数据。谁能帮我？

My Curl Library code :
    public function callApi($jwt_tkn, $url, $postdata, $method)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Bearer ' . $jwt_tkn));
        curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
    }