客户端使用PHP，请求JAVA服务端，遇到中文编码问题，JAVA收到的参数中文乱码，以下是请求方法：

$options = ['pageNum' => $page, 'pageSize' => $pageSize, 'name' => $keyword];
$client = new Client([
    'timeout' => 60,
    'headers' => [
        'Content-Type'=>'application/x-www-form-urlencoded;charset=UTF-8',
        'enctype'=>'multipart/form-data',
        'X-Requested-With' => 'XMLHttpRequest',
    ],
]);
$response = $client->request('POST', env('DL_URL').$this->packages_url, [
    'form_params' => $options,
]);
$body = $response->getBody();
$result = $body->getContents();

header头部有指定UTF-8编码方式，文件也用UTF-8编码，JAVA端也同样使用UTF-8编码，那么JAVA端接收到的中文乱码是怎么回事呢？
以下是解决方法：

$options = ['pageNum' => $page, 'pageSize' => $pageSize, 'name' => $keyword];
$client = new Client([
    'timeout' => 60,
]);
$response = $client->request('POST', env('DL_URL').$this->packages_url, [
    'form_params' => $options,
    //将header头信息加到request方法里
    'headers' => [
        'Content-Type'=>'application/x-www-form-urlencoded;charset=UTF-8',
        'enctype'=>'multipart/form-data',
        'X-Requested-With' => 'XMLHttpRequest',
    ],
]);
$body = $response->getBody();
$result = $body->getContents();

最后，JAVA成功接受到中文，并成功响应。

GuzzleHttp中文文档：GuzzleHttp中文文档