php 七牛云fetch,七牛fetch时报bad token

require 'basic/vendor/autoload.php';

use Qiniu\Auth;

use Qiniu\Http\Client;

$accessKey = '';

$secretKey = '';

// 构建鉴权对象

$auth = new Auth($accessKey, $secretKey);

$fetch = Qiniu\base64_urlSafeEncode("http://mmbiz.qpic.cn/mmbiz/yfkicc71icAg908Ox9qsRA1KqRxv3tlG3Gwm1bfXkDGR10DlKDnSUqZ6gvOnXUiaak6JYGTgDdolCsBjHzbqx8WBg/0");

$to = Qiniu\base64_urlSafeEncode("huidian");

$path = "/fetch/$fetch/to/$to";

$url = "http://iovip.qbox.me$path";

// 生成上传 Token

$access_token = $auth->sign($path . "\n");

$header[] = 'Content-Type: application/x-www-form-urlencoded';

$header[] = "Authorization: QBox $access_token";

//$curl = curl_init($url);

//

//curl_setopt($curl, CURLOPT_POST, true);

//curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

//curl_setopt($curl, CURLOPT_HEADER, true);

//curl_setopt($curl, CURLOPT_HTTPHEADER, $header);

//

//$con = curl_exec($curl);

//

//curl_close($curl);

return $curl;

//

//if ($con === false) {

// echo 'CURL ERROR: ' . curl_error($curl);

//} else {

// echo $con;

//}

$resp = Client::post($url, "hello", $header);

if ($resp->ok()) {

var_dump($resp);

// $has_icon = true;

} else {

var_dump($resp);

// $has_icon = false;

} echo $resp;

var_dump($resp);

} else {

// echo $resp;

var_dump($resp);

}