如何使用curl php调用webservice获取基于数据的ID？

Question

我有简单的REST Web服务，用于获取基于“密钥加密”的数据的ID，我想使用PHP curl调用此Web服务，当我获得数据“密钥加密”时，我要导出文件并可以下载。 但是我已经尝试了我的代码并成功下载，但是没有将数据“加密”到文件中，如何调用Web服务将数据加密到文件中？

这是我的网络服务

@Produces(MediaType.APPLICATION_JSON)
    @GetMapping(path= "/getKey/{company_id}")
    String getKey(@PathVariable String company_id) {
    String encKey = null;
    try {
        KeyEntity key = gkrepo.findById(company_id).get();
        encKey= key.getKeyencrypted();

        return encKey;
    }catch(NoSuchElementException ex2) {
        return "Error, Key tidak ditemukan";
    }catch (Exception ex){
        return "Other error, " + ex.getMessage();
    }

    } 

这是我的PHP

<?php 
session_start();

if ($_SESSION ['username'] && $_SESSION ['status'] && $_SESSION ['ip'] && $_SESSION ['agent'] && $_SESSION ['idx'] && $_SESSION ['pyrCode']) {

include("koneksi/config.php");

        $username = mysql_escape_string($_SESSION['username']);
        $status = mysql_escape_string($_SESSION['status']);
        $approve = mysql_escape_string($_GET['approve']);
        $reject = mysql_escape_string($_GET['reject']);
        $ip = mysql_escape_string($_SESSION['ip']);
        $idx = mysql_escape_string($_SESSION['idx']);
        $agent = mysql_escape_string($_SESSION['agent']);
        $pyrCode = mysql_escape_string($_SESSION['pyrCode']);

//check user
if ($_SESSION['agent'] != $_SERVER['HTTP_USER_AGENT'] || $_SESSION['ip'] != $_SERVER['REMOTE_ADDR'])
{
    echo "<script>window.location = 'index.php'</script>";
}
    $url ='http://localhost:10000/getKey/{company_id}'. $pyrCode;
    $curl = curl_init();

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HTTPHEADER, array('companyid: ' .$pyrCode));
    curl_setopt($curl, CURLOPT_URL, $url);

    file_put_contents("key.key", $result);
    header('Content-Type: application/pgp-keys');
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"mitra.key\""); 
    echo $result;

    $data = curl_exec($curl);
    if ($result === FALSE) {
        die('Curl failed: ' . curl_error($curl));
    }

    curl_close($curl);
    $decoded1 = json_decode($curl_response,true);
    if (isset($decoded1->response->status) && $decoded1->response->status == 'ERROR') {
        die('error occured: ' . $decoded1->response->errormessage);
    }
    echo 'response ok!';
    var_export($decoded1->response);
}
?>

这是我的内容文件

response ok