PHP cURL and response code 302 - php

Question

I'm trying to make a POST sending a page with the following code:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.olx.es/posting_success.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
curl_setopt($ch, CURLINFO_HEADER_OUT, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTREDIR, 2);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, array("itemid" => $json['id'], "sh" => $json['sh']));
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type: application/x-www-form-urlencoded"));
$response = curl_exec($ch);
curl_close($ch);
And in doing so I returned a server error saying "Invalid Request".
I've noticed that if I do the request manually by telnet, the first time I returned a 302, despite the fact that I've put to follow him, not work, and maybe it's this.
With wireshark obtained what the customer actually sent, what am I doing wrong?
**Hypertext Transfer Protocol:**
POST /posting_success.php HTTP/1.1
Host: www.olx.es
Connection: keep-alive
Content-Length: 52
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Origin: http://www.olx.es
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31
Content-Type: application/x-www-form-urlencoded
Referer: http://www.olx.es/posting.php?categ_id=322
Accept-Encoding: gzip,deflate,sdch
Accept-Language: es-ES,es;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
**Line-based text data: application/x-www-form-urlencoded:**
itemid=501347053&sh=b9302ed20769ae3717f896a33a369aa2
Sorry for my english..

Answer 1

It Seems You have Problem in POST request. please Try
$fields=array('itemid' => $json['id'], 'sh' =>urlencode ($json['sh']));
Format Your Fields
foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
rtrim($fields_string,'&');
Then Use in Curl OPt
curl_setopt($ch1,CURLOPT_POST,count($fields));
curl_setopt($ch1,CURLOPT_POSTFIELDS,$fields_string);

Answer 2

There is no need to make custom request, sent such headers or use CURLINFO_HEADER_OUT.
Try this:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.olx.es/posting_success.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTREDIR, 2);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query( array("itemid" => $json['id'], "sh" => $json['sh']) ));
$response = curl_exec($ch);
curl_close($ch);

Answer 3

the problem is, this form is not multipart/form-data, and then you will to create a query string to post. See the manpage http://php.net/manual/en/function.curl-setopt.php. you give then an array. The the header will be set a multipart/form-data. And this is the invalid request.
THE SOLUTION IS
The string is simple to build "&itemid=".json['id']."&sh=".json['sh'];
put this in the CURLOPT_POSTFIELDS.
saludos (bye) and sorry for my english...