PHP cURL POST bad output - php

Question

I am getting some info from a https web server using PHP plus cURL. All info got as HTTP GET is ok but when I need to do some HTTP POST I get a no sense output. Web server is ok as If i get the info from a web browser all works ok.
I am using following code:
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1");
if($method == "POST"){
print_r($post_fields);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($ch,CURLOPT_HTTPHEADER, array (
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"Accept-Language: es-es,es;q=0.8,en-us;q=0.5,en;q=0.3",
"Accept-Encoding: gzip, deflate",
"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7"
));
}
if ($usecookie) {
curl_setopt($ch, CURLOPT_COOKIEJAR, $usecookie);
curl_setopt($ch, CURLOPT_COOKIEFILE, $usecookie);
}
if ($refer != "") {
curl_setopt($ch, CURLOPT_REFERER, $refer );
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
Answer header is:
HTTP/1.1 200 OK
Date: Sun, 20 Nov 2011 11:04:39 GMT
Server: Apache
Cache-Control: must-revalidate
Pragma: no-cache
Expires: Thu, 01 Jan 1970 00:00:00 GMT
max-age: Thu, 01 Jan 1970 00:00:00 GMT
X-Powered-By: Servlet/2.4 JSP/2.0
idWl: PRO-LOW16_6604
Vary: Accept-Encoding
Content-Encoding: gzip
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
Any idea about where the problem could be?

Answer 1

It clearly shows its gziped...
Content-Encoding: gzip
Transfer-Encoding: chunked
Passing the returned data through the below function will inflate it back to readable content.
function gzdecoder($d){
$f=ord(substr($d,3,1));
$h=10;$e=0;
if($f&4){
$e=unpack('v',substr($d,10,2));
$e=$e[1];$h+=2+$e;
}
if($f&8){
$h=strpos($d,chr(0),$h)+1;
}
if($f&16){
$h=strpos($d,chr(0),$h)+1;
}
if($f&2){
$h+=2;
}
$u = gzinflate(substr($d,$h));
if($u===FALSE){
$u=$d;
}
return $u;
}