Не пойму что возвращает POST

$url = "http://www.baikalsr.ru/bitrix/templates/baikal_new_design/ajax/status_gruza.php";
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL,$url); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); 
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Accept: application/json, text/javascript, */*; q=0.01',
    'Accept-Encoding: gzip, deflate',
    'Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3',
    'Cache-Control: no-cache',
    'Connection: keep-alive',
    'Content-Type: application/x-www-form-urlencoded; charset=utf-8',
    'Cookie: BITRIX_SM_GUEST_ID=739175; BITRIX_SM_LAST_VISIT=12.12.2013+16%3A38%3A58; BITRIX_SM_BANNERS=1_59_3_13122013%2C1_8_1_13122013; __utma=185330490.1367634782.1386243713.1386846060.1386850589.3; __utmz=185330490.1386243713.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); PHPSESSID=97o120lacltuq1vdh0pvvftfd6; __utmc=185330490; cityPic=1; __utmb=185330490.12.9.1386851949787',
    'Host: www.baikalsr.ru',
    'Pragma: no-cache',
    'Referer: http://www.baikalsr.ru/vidgets/tracking/',
    'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:23.0) Gecko/20100101 Firefox/23.0' ,
    'X-Requested-With: XMLHttpRequest'
              ));
curl_setopt($ch, CURLOPT_POSTFIELDS, 'go=OK&status_index=&status_load=%D0%9D%D0%9D-%D0%B0002243&status_time=1386851950'); 
$result = curl_exec($ch);
echo $result ;
curl_close($ch);