API请求在Postman中有效，但在Guzzle中失败

Question

所以我一直在尝试向期待的Wordpress API发出请求 http标头中的用户名和密码。

我在Postman尝试了这个，它完美无缺。

cURL代码：

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "http://localhost/wptesting/wp-content/plugins/multisite-json-api/endpoints/create-site.php",
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\n    \"title\" : \"test\",\n    \"email\" : \"test@email.com\",\n    \"site_name\" : \"test\"\n}",
  CURLOPT_HTTPHEADER => array(
    "content-type: application/json",
    "password: dummypassword",
    "user: dummyuser"
  ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

?>

然而......当我和Guzzle尝试同样的事情时，我得到了这样的回应： {“id”：“access_denied”，“message”：“无效的用户名或密码”，“网址”：...}

代码：

<?php

require_once 'vendor/autoload.php';

use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;

$client = new Client();

$res = $client->request('POST', 'http://localhost/wptesting/wp-content/plugins/multisite-json-api/endpoints/create-site.php', 
['json' => 
    ['email' => 'test@email.com',
    'site_name' => 'test',
    'title' => 'test'
    ]
],['headers' => 
    ["password" => "dummypassword",
     "user" => "dummyuser"
    ]
]);

?>

我不知道我做错了什么......