php 使用curl请求https 错误码 errcode 43009 errmsg post参数需要json类型

$url = 'https://www.xxx.com';

$header = array('Content-Type:application/json;Charset=utf-8');//增加$header 设置 Content-Type:application/json

$param = json类型数据
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);//地址
//curl_setopt($curl, CURLOPT_HEADER, 1);

curl_setopt($curl, CURLOPT_HEADER, $header);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($curl, CURLOPT_POST, 1);

curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求不验证证书

curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);// https请求不验证hosts

curl_setopt($curl, CURLOPT_POSTFIELDS, $param);//json 数据

$data = json_decode(curl_exec($curl));
curl_close($curl);
var_dump($data);