POST数据不会发送到PHP脚本

Question

我的应用尝试发送这样的POST数据：

HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
HttpPost httppost = new HttpPost("http://localhost/mydir/");

try {
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
    nameValuePairs.add(new BasicNameValuePair("sender_app", "My app"));
    nameValuePairs.add(new BasicNameValuePair("someString", "My string"));
    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
    // TODO Auto-generated catch block
} catch (IOException e) {
    // TODO Auto-generated catch block
}       

脚本记录此请求以进行测试，如下所示：

ob_start();
var_dump($_REQUEST);
$request_dump = "_REQUEST: ".ob_get_clean();
file_put_contents("requests.log",$request_dump, FILE_APPEND | LOCK_EX);

该应用成功发出请求并将其记录，但$_REQUEST超全局始终为空，并且未设置sender_app和someString个帖子变量。

$_SERVER[HTTP_USER_AGENT]报告为Apache-HttpClient/UNAVAILABLE (java 1.4)，因此至少会发送_REQUEST: array(0) { } 。

日志如下所示：

{{1}}

可能是什么问题？