ionic 2 http.post cannot waiting response >= 7 seconds - php

Question

sorry if my language is not good.
i have a ionic app, this app send data with angular http.post to server my company, this is my script on server :
<?php
set_time_limit(120);
ini_set("max_execution_time",120);
date_default_timezone_set("Asia/Jakarta");
require_once("menu.php");
class serviceController extends menu
{
private $clientInput;
public function __construct($clientInput){
$this->clientInput = $clientInput;
$this->Controller();
}
private function getMenu($packageName){
parent::__construct($packageName);
echo json_encode(parent::menu());
}
private function Controller(){
$Decode = json_decode($this->clientInput);
if($Decode->id=="getMenu"){
$this->getMenu($Decode->packageName);
}else if($Decode->id=="Development"){
sleep(15);
echo '{"status":"1","info":"Success"}';
}else{
switch($Decode->packageName){
case "com.guava.manis.mobile.payment":{
$this->doRequest("http://xxx.xxx.xxx.xxx/multiflat_new.jsp");
break;
}
}
}
}
private function doRequest($target){
$ch = curl_init($target);
$input = str_replace(':"",',':"-",',str_replace(':false,',':"-",',str_replace(':0,',':"-",',$this->clientInput)));
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_POSTFIELDS,$input);
curl_setopt($ch,CURLOPT_HTTPHEADER,array('Content-Type:application/json'));
$response = curl_exec($ch);
$finalResponse = rtrim("1",$response);
echo $finalResponse;
}
}
$clientInput = file_get_contents("php://input");
new serviceController($clientInput);
this is my script on my ionic app :
httpPOST(){
var request = JSON.stringify(this.finalREQ);
console.log("httpPOST request : "+request);
let headers = new Headers({'Content-Type': 'application/json'});
let options = new RequestOptions({ headers: headers });
return this.http.post(this.postUrl,request,options).timeout(50000)
}
when i send data json to server with field 'id' is 'Development' my script will be sleep 15 seconds, the problem is ionic app not receive response from server, but if i change sleep <=7 seconds it's works, my question is how to create ionic app can wait response >=7 seconds ?, but if my scripts on server i move to localhost, dan i send data to localhost it's works perfectly, where the problem ?, on my server scripts, my ionic app scripts, or on my configuration of apache ?