Неверный HTTP-ответ

Я пытаюсь отправить запрос на страницу PHP с Java.

<?php
include "connect.php";
$uname = $_POST['uname'];
$pass = $_POST['pass'];
$result = signin();
if($result == "1"){
echo "1";
}else{
echo "0";
}

function signin(){
global $uname;
global $pass;
global $db;

$connect = $db->prepare("SELECT * FROM user where uname=? and pass=?");
$connect->execute(array($uname,$pass));
$result = $connect->fetchAll(PDO::FETCH_ASSOC);

foreach($result as $row){
return 1;
}
return 0;
}
?>

Мой метод Java:

public int checkPass(){
try{
// open a connection to the site
URL url = new URL("http://192.168.1.35/userControls/singin.php");
URLConnection con = (HttpURLConnection)url.openConnection();
((HttpURLConnection) con).setRequestMethod("POST");
// activate the output
con.setDoOutput(true);
//con.setDoInput(true);
PrintStream ps = new PrintStream(con.getOutputStream());
ps.print(URLEncoder.encode("?uname","UTF-8") + "=" + URLEncoder.encode(uname, "UTF-8"));
ps.print(URLEncoder.encode("&pass=","UTF-8")+ "=" + URLEncoder.encode(pass, "utf-8"));

ps.close();
BufferedReader cin = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line = null;
while ((line = cin.readLine()) != null) {
System.out.println(":::::::Worked:::::::::   " + line);
}
}/* catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}*/ catch (Exception e) {
System.out.println("Eror:" + e.getMessage());
}

return 1;
}

Но когда я запускаю это, появляется ошибка: (INVALID HTTP RESPONSE)

java.io.IOException: Неверный Http-ответ
на sun.net.www.protocol.http.HttpURLConnection.getInputStream0 (HttpURLConnection.java:1555)
на sun.net.www.protocol.http.HttpURLConnection.getInputStream (HttpURLConnection.java:1441)
в CapitalizeServer $ Capitalizer.checkPass (CapitalizeServer.java:171)
в CapitalizeServer $ Capitalizer.run (CapitalizeServer.java:64)

Строка 171 файла CapitalizeServer.java:

BufferedReader cin = new BufferedReader(new InputStreamReader(con.getInputStream()));

Я использую WAMP Server-2.4.9

Как я могу решить эту проблему?