无法根据 cURL 请求解析主机 PHP

Question

我开始构建我的第一个 API，在本地主机上成功测试后（Mac OS X El Capitan）我将它上传到我的 digitalocean 服务器运行宁 Ubuntu 16.04.

我都尝试过运行来自本地主机和存储 API 的服务器的 cURL 请求，但它们都 return "Could not resolve host" 错误错误编号 6。我的代码：

在API这边只是

echo "200";exit;

在客户端

$token = 'this is the session token';
$url = "http://xx.xx.xx.xx/API/index.php";
$data = array('username'=>'username','password'=>'password');
$datajson = json_encode($data);

$message = $url . $datajson . 'PUT';
$publishThis = base64_encode(
        hash_hmac('sha256', $message, 'secret key', true)
    );
    $len = 'Content-Length: ' . strlen($message);
$ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, urlencode($url));
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',$len, 'Authorization: ' . $publishThis));
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
    curl_setopt($ch, CURLOPT_POSTFIELDS,$datajson);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    $response  = curl_exec($ch);

求助！！

P.S：如果我删除 urlencode 函数，请求将花费大约 20 分钟并以 400 错误请求错误结束

Answer 1

后期编辑：

$token = 'this is the session token';
$url = "http://xx.xx.xx.xx/API/index.php";
$data = array('username'=>'username','password'=>'password');
$datajson = json_encode($data);
$build_query = http_build_query($data);

$message = $url . $datajson . 'PUT';
$publishThis = base64_encode(
        hash_hmac('sha256', $message, 'secret key', true)
);
$len = 'Content-Length: ' . strlen($build_query);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',$len, 'Authorization: ' . $publishThis));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_POSTFIELDS,$build_query);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$response  = curl_exec($ch);

if($errno = curl_errno($ch)) {
    $error_message = curl_strerror($errno);
    echo "cURL error ({$errno}):\n {$error_message}";
}   

echo $response;

变化：

$build_query = http_build_query($data);

$len = 'Content-Length: ' . strlen($build_query);

curl_setopt($ch, CURLOPT_POSTFIELDS,$build_query)

从 CURLOPT_URL

中删除 url 编码

无法根据 cURL 请求解析主机 PHP

Could not resolve host on cURL request PHP

php

curl

ubuntu-16.04