我有一个代理容器，它向一个API容器发出curl请求。下面是代理容器的curl请求：

$postRequest = [
        'email' => $_POST['email'],
        'password' => $_POST['password']
        ];
    pretty_var_dump($postRequest);
        
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, 'http://api:80');
        curl_setopt($curl, CURLOPT_POSTFIELDS, $post_request);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_HTTPHEADER, $post_request);
        $curl_response = curl_exec($curl);
        curl_close($curl);
        
        $response = json_decode($curl_response, true);

        pretty_var_dump($response);

下面是api文件的代码：

<?php

// return api results
header('Content-Type: application/json; charset=utf-8');

include_once('functions.php');
include_once('config.php');

$conn = new mysqli($host, $user, $pass, $mydatabase);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} else {
    echo "Connected to MySQL server successfully!";
}

$email = $_POST['email'];
$signin_password = $_POST['password'];



$select_query = "SELECT user_password, user_id, user_email, user_status FROM user_login WHERE user_email = '{$email}'";

echo $select_query;
$result = $conn->query($select_query);

if (isset($result)) {
    $result = $result->fetch_all(MYSQLI_ASSOC);
    pretty_var_dump($result);
    if (isset($result[0])) {
        $result = $result[0];

        if (isset($result['user_password']) && $result['user_password']) {
            if ($result['user_password']) {
                if (isset($result['user_status']) && $result['user_status'] === "1" && isset($result['user_id'])) {
                    $_SESSION['loggedIn'] = $result['user_status'];
                    response(['user_id' => $result['user_id'], 'session' => $result['user_status']], 200, 'Sign in successful');
                } elseif (isset($result['user_status']) && $result['user_status'] === "2" && isset($result['user_id'])) {
                    $_SESSION['loggedIn'] = $result['user_status'];
                    response(['user_id' => $result['user_id'], 'session' => $result['user_status']], 200, 'Sign in successful');
                }
            } else {
                $_SESSION['loggedIn'] = false;
                response('N/A', 401, 'Password incorrect');
            }
        }
    } else {
        response('N/A', 401, 'Email address not found');
    }
}

由于某种原因，API文件没有从curl中阅读POST数据，因此每次都返回null。MYSQLI，curl都已安装，如果手动向API文件传递正确的用户名和密码，它将完美工作。
任何帮助都将不胜感激！

EDIT我已经更新了curl请求的代码，但是我仍然收到空值。api代码保持不变。是否有什么明显的地方我遗漏了？

$email = $_POST['email'];
        $password = $_POST['password'];

        // $data = http_build_query($postRequest);
        $data = '{"email":"'.$email.'", "password":"'.$password.'"}';

        $headers = array(
            "Content-Type: application/json",
            "Accept: application/json",
         );
        

        pretty_var_dump($data);

        
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, 'http://127.0.0.1:86');
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        $curl_response = curl_exec($curl);
        curl_close($curl);
        
        $response = json_decode($curl_response, true);

        pretty_var_dump($response);