How to duplicate a POST Request with CURL in PHP - php

Question

I have a webapp that needs to be able to recreate the post actions of application provided by our vendor. The application allows the user to log in or out of phone workgroups. I have captured the HTTP Post request that the application is sending to initiate a session and to log the user in and out of the workgroups. I would like to recreate these POSTs in PHP using CURL, but I am having some issues getting the POST correct.
The post I am trying to emulate as captured from WireShark looks like this :
POST /Login?timeout=6 HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: 10.1.##.##:5447
Content-Length: 160
Expect: 100-continue
Connection: Keep-Alive
{"username":"joell","user-auth-token":"TOKENTOKENTOKEN","user-role":"admin_role","client-type":3,"app-id":"cmwin.18.62.7800.0"}
Response
HTTP/1.1 200 OK
Content-Length: 58
Content-Type: text/plain; charset=UTF-8
Connection: Keep-Alive
Cache-Control: no-store
Date: Fri, 03 Apr 2015 13:08:42 GMT
Expires: Fri, 03 Apr 2015 13:08:42 GMT
Access-Control-Allow-Origin: *
Set-Cookie: SessionId=2006727099
My php code atempting to recreate this is:
$data = array(
"username" => "joell",
"user-auth-token" => "TOKENTOKENTOKEN",
"user-role" => "admin_role",
"client-type" => 3,
"app-id" => "cmwin.18.62.7800.0"
);
$data_string = json_encode($data);
$curl = curl_init('http://10.1.##.##:5447/Login?timeout=6');
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Content-Type: application/x-www-form-urlencoded',
'Content-Length: ' . strlen($data_string),
'Expect: 100-continue',
'Connection: Keep-Alive')
);
if(!curl_exec($curl)){
die('Error: "' . curl_error($curl) . '" - Code: ' . curl_errno($curl));
}
$result = curl_exec($curl);
print_r($result);
curl_close($curl);
The request that my script is generating is:
POST /Login?timeout=6 HTTP/1.1
Host: 10.1.##.##:5447
Accept: */*
Content-Type: application/x-www-form-urlencoded
Content-Length: 160
Expect: 100-continue
Connection: Keep-Alive
{"username":"joell","user-auth-token":"TOKETOKETOKEN","user-role":"admin_role","client-type":3,"app-id":"cmwin.18.62.7800.0"}
Response
HTTP/1.1 200 OK
Content-Length: 20
Content-Type: text/plain; charset=UTF-8
Connection: Keep-Alive
Cache-Control: no-store
Date: Fri, 03 Apr 2015 15:15:44 GMT
Expires: Fri, 03 Apr 2015 15:15:44 GMT
Access-Control-Allow-Origin: *
Currently the output of my PHP script is :
{"error":2147483650}